[syzbot] [bluetooth?] KASAN: slab-use-after-free Read in hci_sock_get_channel

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syzbot

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May 25, 2025, 3:44:33 AM5/25/25

to johan....@gmail.com, linux-b...@vger.kernel.org, linux-...@vger.kernel.org, luiz....@gmail.com, mar...@holtmann.org, syzkall...@googlegroups.com

Hello,

syzbot found the following issue on:

HEAD commit: 187899f4124a Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=14e5a0e8580000
kernel config: https://syzkaller.appspot.com/x/.config?x=770ccfad24d7220
dashboard link: https://syzkaller.appspot.com/bug?extid=0a7039d5d9986ff4ecec
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1648fe70580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d14028020c58/disk-187899f4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5416eb354254/vmlinux-187899f4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/02cbbb8d7877/Image-187899f4.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0a7039...@syzkaller.appspotmail.com

===================================
==================================================================
BUG: KASAN: slab-use-after-free in hci_sock_get_channel+0x60/0x68 net/bluetooth/hci_sock.c:91
Read of size 2 at addr ffff0000c48885b2 by task syz.4.334/7318

CPU: 0 UID: 0 PID: 7318 Comm: syz.4.334 Not tainted 6.15.0-rc7-syzkaller-g187899f4124a #0 PREEMPT
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
print_address_description+0xa8/0x254 mm/kasan/report.c:408
print_report+0x68/0x84 mm/kasan/report.c:521
kasan_report+0xb0/0x110 mm/kasan/report.c:634
__asan_report_load2_noabort+0x20/0x2c mm/kasan/report_generic.c:379
hci_sock_get_channel+0x60/0x68 net/bluetooth/hci_sock.c:91
mgmt_pending_find+0x7c/0x140 net/bluetooth/mgmt_util.c:223
pending_find net/bluetooth/mgmt.c:947 [inline]
remove_adv_monitor+0x44/0x1a4 net/bluetooth/mgmt.c:5445
hci_mgmt_cmd+0x780/0xc00 net/bluetooth/hci_sock.c:1712
hci_sock_sendmsg+0x544/0xbb0 net/bluetooth/hci_sock.c:1832
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
sock_write_iter+0x25c/0x378 net/socket.c:1131
new_sync_write fs/read_write.c:591 [inline]
vfs_write+0x62c/0x97c fs/read_write.c:684
ksys_write+0x120/0x210 fs/read_write.c:736
__do_sys_write fs/read_write.c:747 [inline]
__se_sys_write fs/read_write.c:744 [inline]
__arm64_sys_write+0x7c/0x90 fs/read_write.c:744
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

Allocated by task 7037:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x40/0x78 mm/kasan/common.c:68
kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4327 [inline]
__kmalloc_noprof+0x2fc/0x4c8 mm/slub.c:4339
kmalloc_noprof include/linux/slab.h:909 [inline]
sk_prot_alloc+0xc4/0x1f0 net/core/sock.c:2198
sk_alloc+0x44/0x3ac net/core/sock.c:2254
bt_sock_alloc+0x4c/0x300 net/bluetooth/af_bluetooth.c:148
hci_sock_create+0xa8/0x194 net/bluetooth/hci_sock.c:2202
bt_sock_create+0x14c/0x24c net/bluetooth/af_bluetooth.c:132
__sock_create+0x43c/0x91c net/socket.c:1541
sock_create net/socket.c:1599 [inline]
__sys_socket_create net/socket.c:1636 [inline]
__sys_socket+0xd4/0x1c0 net/socket.c:1683
__do_sys_socket net/socket.c:1697 [inline]
__se_sys_socket net/socket.c:1695 [inline]
__arm64_sys_socket+0x7c/0x94 net/socket.c:1695
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

Freed by task 6607:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x40/0x78 mm/kasan/common.c:68
kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x68/0x88 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x17c/0x474 mm/slub.c:4841
sk_prot_free net/core/sock.c:2237 [inline]
__sk_destruct+0x4f4/0x760 net/core/sock.c:2332
sk_destruct net/core/sock.c:2360 [inline]
__sk_free+0x320/0x430 net/core/sock.c:2371
sk_free+0x60/0xc8 net/core/sock.c:2382
sock_put include/net/sock.h:1944 [inline]
mgmt_pending_free+0x88/0x118 net/bluetooth/mgmt_util.c:290
mgmt_pending_remove+0xec/0x104 net/bluetooth/mgmt_util.c:298
mgmt_set_powered_complete+0x418/0x5cc net/bluetooth/mgmt.c:1355
hci_cmd_sync_work+0x204/0x33c net/bluetooth/hci_sync.c:334
process_one_work+0x7e8/0x156c kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x958/0xed8 kernel/workqueue.c:3400
kthread+0x5fc/0x75c kernel/kthread.c:464
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847

The buggy address belongs to the object at ffff0000c4888000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1458 bytes inside of
freed 2048-byte region [ffff0000c4888000, ffff0000c4888800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x104888
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000040 ffff0000c0002000 fffffdffc3279400 0000000000000002
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 05ffc00000000040 ffff0000c0002000 fffffdffc3279400 0000000000000002
head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 05ffc00000000003 fffffdffc3122201 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff0000c4888480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000c4888500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000c4888580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff0000c4888600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000c4888680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Unable to handle kernel paging request at virtual address dfff8000000000b6
KASAN: null-ptr-deref in range [0x00000000000005b0-0x00000000000005b7]
Mem abort info:
ESR = 0x0000000096000005
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x05: level 1 translation fault
Data abort info:
ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
CM = 0, WnR = 0, TnD = 0, TagAccess = 0
GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[dfff8000000000b6] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1] SMP
Modules linked in:
CPU: 0 UID: 0 PID: 7318 Comm: syz.4.334 Tainted: G B 6.15.0-rc7-syzkaller-g187899f4124a #0 PREEMPT
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : hci_sock_get_channel+0x28/0x68 net/bluetooth/hci_sock.c:91
lr : hci_sock_get_channel+0x18/0x68 net/bluetooth/hci_sock.c:90
sp : ffff80009f3477a0
x29: ffff80009f3477a0 x28: 0000000000000000 x27: ffff80008d84e588
x26: ffff0000d7944000 x25: 0000000000000002 x24: dfff800000000000
x23: ffff0000c2586528 x22: 000000000000000d x21: 0000000000000003
x20: ffff0000c2586500 x19: 0000000000000000 x18: 1fffe0003386aa76
x17: 0000000000000000 x16: ffff80008ad27e48 x15: 0000000000000001
x14: 1ffff00012553cfc x13: 0000000000000000 x12: 0000000000000000
x11: ffff700012553cfd x10: dfff800000000000 x9 : 00000000000000b6
x8 : 00000000000005b2 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80009f347018 x4 : ffff80008f415ba0 x3 : ffff80008a076e80
x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000000
Call trace:
hci_sock_get_channel+0x28/0x68 net/bluetooth/hci_sock.c:91 (P)
mgmt_pending_find+0x7c/0x140 net/bluetooth/mgmt_util.c:223
pending_find net/bluetooth/mgmt.c:947 [inline]
remove_adv_monitor+0x44/0x1a4 net/bluetooth/mgmt.c:5445
hci_mgmt_cmd+0x780/0xc00 net/bluetooth/hci_sock.c:1712
hci_sock_sendmsg+0x544/0xbb0 net/bluetooth/hci_sock.c:1832
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
sock_write_iter+0x25c/0x378 net/socket.c:1131
new_sync_write fs/read_write.c:591 [inline]
vfs_write+0x62c/0x97c fs/read_write.c:684
ksys_write+0x120/0x210 fs/read_write.c:736
__do_sys_write fs/read_write.c:747 [inline]
__se_sys_write fs/read_write.c:744 [inline]
__arm64_sys_write+0x7c/0x90 fs/read_write.c:744
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767
el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
Code: 9116ca68 d2d0000a d343fd09 f2fbffea (38ea6929)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 9116ca68 add x8, x19, #0x5b2
4: d2d0000a mov x10, #0x800000000000 // #140737488355328
8: d343fd09 lsr x9, x8, #3
c: f2fbffea movk x10, #0xdfff, lsl #48
* 10: 38ea6929 ldrsb w9, [x9, x10] <-- trapping instruction

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup

syzbot

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May 26, 2025, 4:19:20 AM5/26/25

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For archival purposes, forwarding an incoming command email to
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***

Subject: #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 0ff41df1cb268fc69e703a08a57ee14ae967d0ca
Author: dman...@yandex.ru

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 0ff41df1cb268fc69e703a08a57ee14ae967d0ca

syzbot

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May 26, 2025, 5:02:05 AM5/26/25

to dman...@yandex.ru, linux-...@vger.kernel.org, syzkall...@googlegroups.com

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+0a7039...@syzkaller.appspotmail.com
Tested-by: syzbot+0a7039...@syzkaller.appspotmail.com

Tested on:

commit: 0ff41df1 Linux 6.15
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=10e25170580000
kernel config: https://syzkaller.appspot.com/x/.config?x=2fc22398e1fbdb58
dashboard link: https://syzkaller.appspot.com/bug?extid=0a7039d5d9986ff4ecec
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
userspace arch: arm64
patch: https://syzkaller.appspot.com/x/patch.diff?x=17561df4580000

Note: testing is done by a robot and is best-effort only.

Hillf Danton

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May 26, 2025, 6:51:38 AM5/26/25

to syzbot, linux-...@vger.kernel.org, syzkall...@googlegroups.com

> Date: Sun, 25 May 2025 00:44:31 -0700

> syzbot found the following issue on:
>
> HEAD commit: 187899f4124a Merge branch 'for-next/core' into for-kernelci
> git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=14e5a0e8580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=770ccfad24d7220
> dashboard link: https://syzkaller.appspot.com/bug?extid=0a7039d5d9986ff4ecec
> compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
> userspace arch: arm64
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1648fe70580000

#syz test

--- x/net/bluetooth/mgmt.c
+++ y/net/bluetooth/mgmt.c
@@ -1472,7 +1472,8 @@ static void cmd_complete_rsp(struct mgmt
/* dequeue cmd_sync entries using cmd as data as that is about to be
* removed/freed.
*/
- hci_cmd_sync_dequeue(match->hdev, NULL, cmd, NULL);
+ if (!hci_cmd_sync_dequeue(match->hdev, NULL, cmd, NULL))
+ return;

if (cmd->cmd_complete) {
cmd->cmd_complete(cmd, match->mgmt_status);
--

syzbot

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May 26, 2025, 7:37:04 AM5/26/25

to hda...@sina.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com

commit: d7fa1af5 Merge branch 'for-next/core' into for-kernelci

git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci

console output: https://syzkaller.appspot.com/x/log.txt?x=16fbe8e8580000
kernel config: https://syzkaller.appspot.com/x/.config?x=89c13de706fbf07a
dashboard link: https://syzkaller.appspot.com/bug?extid=0a7039d5d9986ff4ecec

compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
userspace arch: arm64

patch: https://syzkaller.appspot.com/x/patch.diff?x=170e5170580000

syzbot

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May 28, 2025, 3:05:59 PM5/28/25

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For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.

***

Subject: Re: [PATCH v1] Bluetooth: MGMT: Use RCU-protected in mgmt_pending list
Author: luiz....@gmail.com

#syz test

On Wed, May 28, 2025 at 3:03 PM Luiz Augusto von Dentz
<luiz....@gmail.com> wrote:
>
> #syz test
>
> On Wed, May 28, 2025 at 2:44 PM Luiz Augusto von Dentz
> <luiz....@gmail.com> wrote:
> >
> > From: Luiz Augusto von Dentz <luiz.vo...@intel.com>
> >
> > This uses RCU procedures to protect from concurrent access of
> > mgmt_pending list which can cause crashes like:
> >
> > ==================================================================
> > BUG: KASAN: slab-use-after-free in mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5405
> > Read of size 8 at addr ffff888048891a18 by task kworker/u5:8/5333
> >
> > CPU: 0 UID: 0 PID: 5333 Comm: kworker/u5:8 Not tainted 6.15.0-rc5-syzkaller-00197-gea34704d6ad7 #0 PREEMPT(full)
> > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> > Workqueue: hci0 hci_cmd_sync_work
> > Call Trace:
> > <TASK>
> > dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
> > print_address_description mm/kasan/report.c:408 [inline]
> > print_report+0xb4/0x290 mm/kasan/report.c:521
> > kasan_report+0x118/0x150 mm/kasan/report.c:634
> > mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5405
> > hci_cmd_sync_work+0x25e/0x3a0 net/bluetooth/hci_sync.c:334
> > process_one_work kernel/workqueue.c:3238 [inline]
> > process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
> > worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
> > kthread+0x70e/0x8a0 kernel/kthread.c:464
> > ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
> > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
> > </TASK>
> >
> > Allocated by task 5702:
> > kasan_save_stack mm/kasan/common.c:47 [inline]
> > kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
> > poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
> > __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
> > kasan_kmalloc include/linux/kasan.h:260 [inline]
> > __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358
> > kmalloc_noprof include/linux/slab.h:905 [inline]
> > kzalloc_noprof include/linux/slab.h:1039 [inline]
> > mgmt_pending_new+0x65/0x240 net/bluetooth/mgmt_util.c:252
> > mgmt_pending_add+0x34/0x120 net/bluetooth/mgmt_util.c:279
> > remove_adv_monitor+0x103/0x1b0 net/bluetooth/mgmt.c:5453
> > hci_mgmt_cmd+0x9c6/0xef0 net/bluetooth/hci_sock.c:1712
> > hci_sock_sendmsg+0x6ca/0xee0 net/bluetooth/hci_sock.c:1832
> > sock_sendmsg_nosec net/socket.c:712 [inline]
> > __sock_sendmsg+0x219/0x270 net/socket.c:727
> > sock_write_iter+0x258/0x330 net/socket.c:1131
> > new_sync_write fs/read_write.c:591 [inline]
> > vfs_write+0x548/0xa90 fs/read_write.c:684
> > ksys_write+0x145/0x250 fs/read_write.c:736
> > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> > do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
> > entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >
> > Freed by task 5700:
> > kasan_save_stack mm/kasan/common.c:47 [inline]
> > kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
> > kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
> > poison_slab_object mm/kasan/common.c:247 [inline]
> > __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264

> > kasan_slab_free include/linux/kasan.h:233 [inline]
> > slab_free_hook mm/slub.c:2380 [inline]
> > slab_free mm/slub.c:4642 [inline]

> > kfree+0x193/0x440 mm/slub.c:4841
> > mgmt_pending_foreach+0xc9/0x120 net/bluetooth/mgmt_util.c:242
> > mgmt_index_removed+0x10d/0x2f0 net/bluetooth/mgmt.c:9362
> > hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1307
> > __sys_bind_socket net/socket.c:1810 [inline]
> > __sys_bind+0x2c3/0x3e0 net/socket.c:1841
> > __do_sys_bind net/socket.c:1846 [inline]
> > __se_sys_bind net/socket.c:1844 [inline]
> > __x64_sys_bind+0x7a/0x90 net/socket.c:1844
> > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> > do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
> > entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >
> > Fixes: a380b6cff1a2 ("Bluetooth: Add generic mgmt helper API")
> > Closes: https://syzkaller.appspot.com/bug?extid=feb0dc579bbe30a13190
> > Signed-off-by: Dmitry Antipov <dman...@yandex.ru>
> > Signed-off-by: Luiz Augusto von Dentz <luiz.vo...@intel.com>
> > ---
> > net/bluetooth/mgmt_util.c | 25 +++++++++++++++----------
> > 1 file changed, 15 insertions(+), 10 deletions(-)
> >
> > diff --git a/net/bluetooth/mgmt_util.c b/net/bluetooth/mgmt_util.c
> > index 3713ff490c65..c2dc8ddf5f78 100644
> > --- a/net/bluetooth/mgmt_util.c
> > +++ b/net/bluetooth/mgmt_util.c
> > @@ -219,13 +219,20 @@ struct mgmt_pending_cmd *mgmt_pending_find(unsigned short channel, u16 opcode,
> > {
> > struct mgmt_pending_cmd *cmd;
> >
> > - list_for_each_entry(cmd, &hdev->mgmt_pending, list) {
> > + rcu_read_lock();
> > +
> > + list_for_each_entry_rcu(cmd, &hdev->mgmt_pending, list) {
> > if (hci_sock_get_channel(cmd->sk) != channel)
> > continue;
> > - if (cmd->opcode == opcode)
> > +
> > + if (cmd->opcode == opcode) {
> > + rcu_read_unlock();
> > return cmd;
> > + }
> > }
> >
> > + rcu_read_unlock();
> > +
> > return NULL;
> > }
> >
> > @@ -233,14 +240,11 @@ void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev,
> > void (*cb)(struct mgmt_pending_cmd *cmd, void *data),
> > void *data)
> > {
> > - struct mgmt_pending_cmd *cmd, *tmp;
> > -
> > - list_for_each_entry_safe(cmd, tmp, &hdev->mgmt_pending, list) {
> > - if (opcode > 0 && cmd->opcode != opcode)
> > - continue;
> > + struct mgmt_pending_cmd *cmd;
> >
> > + cmd = mgmt_pending_find(HCI_CHANNEL_CONTROL, opcode, hdev);
> > + if (cmd)
> > cb(cmd, data);
> > - }
> > }
> >
> > struct mgmt_pending_cmd *mgmt_pending_new(struct sock *sk, u16 opcode,
> > @@ -280,7 +284,7 @@ struct mgmt_pending_cmd *mgmt_pending_add(struct sock *sk, u16 opcode,
> > if (!cmd)
> > return NULL;
> >
> > - list_add_tail(&cmd->list, &hdev->mgmt_pending);
> > + list_add_tail_rcu(&cmd->list, &hdev->mgmt_pending);
> >
> > return cmd;
> > }
> > @@ -294,7 +298,8 @@ void mgmt_pending_free(struct mgmt_pending_cmd *cmd)
> >
> > void mgmt_pending_remove(struct mgmt_pending_cmd *cmd)
> > {
> > - list_del(&cmd->list);
> > + list_del_rcu(&cmd->list);
> > + synchronize_rcu();
> > mgmt_pending_free(cmd);
> > }
> >
> > --
> > 2.49.0
> >
>
>
> --
> Luiz Augusto von Dentz

--
Luiz Augusto von Dentz

syzbot

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May 28, 2025, 3:06:00 PM5/28/25

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***

Subject: Re: [PATCH v1] Bluetooth: MGMT: Use RCU-protected in mgmt_pending list
Author: luiz....@gmail.com

#syz test

On Wed, May 28, 2025 at 3:03 PM Luiz Augusto von Dentz
<luiz....@gmail.com> wrote:
>
> #syz test
>
> On Wed, May 28, 2025 at 2:44 PM Luiz Augusto von Dentz
> <luiz....@gmail.com> wrote:
> >
> > From: Luiz Augusto von Dentz <luiz.vo...@intel.com>
> >
> > This uses RCU procedures to protect from concurrent access of
> > mgmt_pending list which can cause crashes like:
> >

> > ==================================================================

> > BUG: KASAN: slab-use-after-free in mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5405
> > Read of size 8 at addr ffff888048891a18 by task kworker/u5:8/5333
> >
> > CPU: 0 UID: 0 PID: 5333 Comm: kworker/u5:8 Not tainted 6.15.0-rc5-syzkaller-00197-gea34704d6ad7 #0 PREEMPT(full)
> > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> > Workqueue: hci0 hci_cmd_sync_work
> > Call Trace:
> > <TASK>
> > dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
> > print_address_description mm/kasan/report.c:408 [inline]
> > print_report+0xb4/0x290 mm/kasan/report.c:521
> > kasan_report+0x118/0x150 mm/kasan/report.c:634
> > mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5405
> > hci_cmd_sync_work+0x25e/0x3a0 net/bluetooth/hci_sync.c:334
> > process_one_work kernel/workqueue.c:3238 [inline]
> > process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
> > worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
> > kthread+0x70e/0x8a0 kernel/kthread.c:464
> > ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
> > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
> > </TASK>
> >
> > Allocated by task 5702:
> > kasan_save_stack mm/kasan/common.c:47 [inline]
> > kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
> > poison_kmalloc_redzone mm/kasan/common.c:377 [inline]

> > __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
> > kasan_kmalloc include/linux/kasan.h:260 [inline]

> > __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358
> > kmalloc_noprof include/linux/slab.h:905 [inline]
> > kzalloc_noprof include/linux/slab.h:1039 [inline]
> > mgmt_pending_new+0x65/0x240 net/bluetooth/mgmt_util.c:252
> > mgmt_pending_add+0x34/0x120 net/bluetooth/mgmt_util.c:279
> > remove_adv_monitor+0x103/0x1b0 net/bluetooth/mgmt.c:5453
> > hci_mgmt_cmd+0x9c6/0xef0 net/bluetooth/hci_sock.c:1712

> > hci_sock_sendmsg+0x6ca/0xee0 net/bluetooth/hci_sock.c:1832
> > sock_sendmsg_nosec net/socket.c:712 [inline]
> > __sock_sendmsg+0x219/0x270 net/socket.c:727
> > sock_write_iter+0x258/0x330 net/socket.c:1131
> > new_sync_write fs/read_write.c:591 [inline]

> > vfs_write+0x548/0xa90 fs/read_write.c:684
> > ksys_write+0x145/0x250 fs/read_write.c:736
> > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> > do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
> > entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >
> > Freed by task 5700:
> > kasan_save_stack mm/kasan/common.c:47 [inline]
> > kasan_save_track+0x3e/0x80 mm/kasan/common.c:68

> > kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
> > poison_slab_object mm/kasan/common.c:247 [inline]
> > __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264

> > kasan_slab_free include/linux/kasan.h:233 [inline]
> > slab_free_hook mm/slub.c:2380 [inline]
> > slab_free mm/slub.c:4642 [inline]

syzbot

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May 28, 2025, 3:46:06 PM5/28/25

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Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+0a7039...@syzkaller.appspotmail.com
Tested-by: syzbot+0a7039...@syzkaller.appspotmail.com

Tested on:

commit: d7fa1af5 Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci

console output: https://syzkaller.appspot.com/x/log.txt?x=17e26bf4580000

kernel config: https://syzkaller.appspot.com/x/.config?x=89c13de706fbf07a
dashboard link: https://syzkaller.appspot.com/bug?extid=0a7039d5d9986ff4ecec
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
userspace arch: arm64

patch: https://syzkaller.appspot.com/x/patch.diff?x=164c83f4580000

syzbot

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Jun 2, 2025, 2:01:45 PM6/2/25

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***

Subject: Re: [PATCH v3] Bluetooth: MGMT: Protect mgmt_pending list with its own lock
Author: luiz....@gmail.com

#syz test

On Mon, Jun 2, 2025 at 2:00 PM Luiz Augusto von Dentz
<luiz....@gmail.com> wrote:
>
> #syz test
>
> On Mon, Jun 2, 2025 at 1:46 PM Luiz Augusto von Dentz

> <luiz....@gmail.com> wrote:
> >
> > From: Luiz Augusto von Dentz <luiz.vo...@intel.com>
> >

> > This uses a mutex to protect from concurrent access of mgmt_pending

> > list which can cause crashes like:
> >

> > ==================================================================

> > __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
> > kasan_kmalloc include/linux/kasan.h:260 [inline]

> > kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
> > poison_slab_object mm/kasan/common.c:247 [inline]
> > __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264

> > kasan_slab_free include/linux/kasan.h:233 [inline]
> > slab_free_hook mm/slub.c:2380 [inline]
> > slab_free mm/slub.c:4642 [inline]

> > Closes: https://syzkaller.appspot.com/bug?extid=0a7039d5d9986ff4ececi
> > Closes: https://syzkaller.appspot.com/bug?extid=cc0cc52e7f43dc9e6df1
> > Reported-by: syzbot+feb0dc...@syzkaller.appspotmail.com
> > Tested-by: syzbot+feb0dc...@syzkaller.appspotmail.com
> > Tested-by: syzbot+0a7039...@syzkaller.appspotmail.com
> > Tested-by: syzbot+cc0cc5...@syzkaller.appspotmail.com

> > Signed-off-by: Dmitry Antipov <dman...@yandex.ru>
> > Signed-off-by: Luiz Augusto von Dentz <luiz.vo...@intel.com>
> > ---

> > include/net/bluetooth/hci_core.h | 1 +
> > net/bluetooth/hci_core.c | 1 +
> > net/bluetooth/mgmt.c | 101 +++++++++++++++----------------
> > net/bluetooth/mgmt_util.c | 32 ++++++++--
> > net/bluetooth/mgmt_util.h | 4 +-
> > 5 files changed, 80 insertions(+), 59 deletions(-)
> >
> > diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
> > index 2b261e74e2c4..b9ff0e825071 100644
> > --- a/include/net/bluetooth/hci_core.h
> > +++ b/include/net/bluetooth/hci_core.h
> > @@ -546,6 +546,7 @@ struct hci_dev {
> > struct hci_conn_hash conn_hash;
> >
> > struct list_head mesh_pending;
> > + struct mutex mgmt_pending_lock;
> > struct list_head mgmt_pending;
> > struct list_head reject_list;
> > struct list_head accept_list;
> > diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
> > index 04845ff3ad57..f197f5497043 100644
> > --- a/net/bluetooth/hci_core.c
> > +++ b/net/bluetooth/hci_core.c
> > @@ -2487,6 +2487,7 @@ struct hci_dev *hci_alloc_dev_priv(int sizeof_priv)
> >
> > mutex_init(&hdev->lock);
> > mutex_init(&hdev->req_lock);
> > + mutex_init(&hdev->mgmt_pending_lock);
> >
> > ida_init(&hdev->unset_handle_ida);
> >
> > diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
> > index 14a9462fced5..7d9ed7db377f 100644
> > --- a/net/bluetooth/mgmt.c
> > +++ b/net/bluetooth/mgmt.c
> > @@ -1447,22 +1447,17 @@ static void settings_rsp(struct mgmt_pending_cmd *cmd, void *data)
> >
> > send_settings_rsp(cmd->sk, cmd->opcode, match->hdev);
> >
> > - list_del(&cmd->list);
> > -
> > if (match->sk == NULL) {
> > match->sk = cmd->sk;
> > sock_hold(match->sk);
> > }
> > -
> > - mgmt_pending_free(cmd);
> > }
> >
> > static void cmd_status_rsp(struct mgmt_pending_cmd *cmd, void *data)
> > {
> > u8 *status = data;
> >
> > - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, *status);
> > - mgmt_pending_remove(cmd);
> > + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, *status);
> > }
> >
> > static void cmd_complete_rsp(struct mgmt_pending_cmd *cmd, void *data)
> > @@ -1476,8 +1471,6 @@ static void cmd_complete_rsp(struct mgmt_pending_cmd *cmd, void *data)

> >
> > if (cmd->cmd_complete) {
> > cmd->cmd_complete(cmd, match->mgmt_status);

> > - mgmt_pending_remove(cmd);
> > -
> > return;
> > }
> >
> > @@ -1486,13 +1479,13 @@ static void cmd_complete_rsp(struct mgmt_pending_cmd *cmd, void *data)
> >
> > static int generic_cmd_complete(struct mgmt_pending_cmd *cmd, u8 status)
> > {
> > - return mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, status,
> > + return mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, status,
> > cmd->param, cmd->param_len);
> > }
> >
> > static int addr_cmd_complete(struct mgmt_pending_cmd *cmd, u8 status)
> > {
> > - return mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, status,
> > + return mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, status,
> > cmd->param, sizeof(struct mgmt_addr_info));
> > }
> >
> > @@ -1532,7 +1525,7 @@ static void mgmt_set_discoverable_complete(struct hci_dev *hdev, void *data,
> >
> > if (err) {
> > u8 mgmt_err = mgmt_status(err);
> > - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, mgmt_err);
> > + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_err);
> > hci_dev_clear_flag(hdev, HCI_LIMITED_DISCOVERABLE);
> > goto done;
> > }
> > @@ -1707,7 +1700,7 @@ static void mgmt_set_connectable_complete(struct hci_dev *hdev, void *data,
> >
> > if (err) {
> > u8 mgmt_err = mgmt_status(err);
> > - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, mgmt_err);
> > + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_err);
> > goto done;
> > }
> >
> > @@ -1943,8 +1936,8 @@ static void set_ssp_complete(struct hci_dev *hdev, void *data, int err)
> > new_settings(hdev, NULL);
> > }
> >
> > - mgmt_pending_foreach(MGMT_OP_SET_SSP, hdev, cmd_status_rsp,
> > - &mgmt_err);
> > + mgmt_pending_foreach(MGMT_OP_SET_SSP, hdev, true,
> > + cmd_status_rsp, &mgmt_err);
> > return;
> > }
> >
> > @@ -1954,7 +1947,7 @@ static void set_ssp_complete(struct hci_dev *hdev, void *data, int err)
> > changed = hci_dev_test_and_clear_flag(hdev, HCI_SSP_ENABLED);
> > }
> >
> > - mgmt_pending_foreach(MGMT_OP_SET_SSP, hdev, settings_rsp, &match);
> > + mgmt_pending_foreach(MGMT_OP_SET_SSP, hdev, true, settings_rsp, &match);
> >
> > if (changed)
> > new_settings(hdev, match.sk);
> > @@ -2074,12 +2067,12 @@ static void set_le_complete(struct hci_dev *hdev, void *data, int err)
> > bt_dev_dbg(hdev, "err %d", err);
> >
> > if (status) {
> > - mgmt_pending_foreach(MGMT_OP_SET_LE, hdev, cmd_status_rsp,
> > - &status);
> > + mgmt_pending_foreach(MGMT_OP_SET_LE, hdev, true, cmd_status_rsp,
> > + &status);
> > return;
> > }
> >
> > - mgmt_pending_foreach(MGMT_OP_SET_LE, hdev, settings_rsp, &match);
> > + mgmt_pending_foreach(MGMT_OP_SET_LE, hdev, true, settings_rsp, &match);
> >
> > new_settings(hdev, match.sk);
> >
> > @@ -2138,7 +2131,7 @@ static void set_mesh_complete(struct hci_dev *hdev, void *data, int err)
> > struct sock *sk = cmd->sk;
> >
> > if (status) {
> > - mgmt_pending_foreach(MGMT_OP_SET_MESH_RECEIVER, hdev,
> > + mgmt_pending_foreach(MGMT_OP_SET_MESH_RECEIVER, hdev, true,
> > cmd_status_rsp, &status);
> > return;
> > }
> > @@ -2638,7 +2631,7 @@ static void mgmt_class_complete(struct hci_dev *hdev, void *data, int err)
> >
> > bt_dev_dbg(hdev, "err %d", err);
> >
> > - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> > + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
> > mgmt_status(err), hdev->dev_class, 3);
> >
> > mgmt_pending_free(cmd);
> > @@ -3427,7 +3420,7 @@ static int pairing_complete(struct mgmt_pending_cmd *cmd, u8 status)
> > bacpy(&rp.addr.bdaddr, &conn->dst);
> > rp.addr.type = link_to_bdaddr(conn->type, conn->dst_type);
> >
> > - err = mgmt_cmd_complete(cmd->sk, cmd->index, MGMT_OP_PAIR_DEVICE,
> > + err = mgmt_cmd_complete(cmd->sk, cmd->hdev->id, MGMT_OP_PAIR_DEVICE,
> > status, &rp, sizeof(rp));
> >
> > /* So we don't get further callbacks for this connection */
> > @@ -5196,7 +5189,7 @@ static void mgmt_add_adv_patterns_monitor_complete(struct hci_dev *hdev,
> > hci_update_passive_scan(hdev);
> > }
> >
> > - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> > + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
> > mgmt_status(status), &rp, sizeof(rp));
> > mgmt_pending_remove(cmd);
> >
> > @@ -5411,7 +5404,7 @@ static void mgmt_remove_adv_monitor_complete(struct hci_dev *hdev,
> > if (!status)
> > hci_update_passive_scan(hdev);
> >
> > - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> > + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
> > mgmt_status(status), &rp, sizeof(rp));
> > mgmt_pending_remove(cmd);
> >
> > @@ -5792,7 +5785,7 @@ static void start_discovery_complete(struct hci_dev *hdev, void *data, int err)
> > cmd != pending_find(MGMT_OP_START_SERVICE_DISCOVERY, hdev))
> > return;
> >
> > - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, mgmt_status(err),
> > + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_status(err),
> > cmd->param, 1);
> > mgmt_pending_remove(cmd);
> >
> > @@ -6013,7 +6006,7 @@ static void stop_discovery_complete(struct hci_dev *hdev, void *data, int err)
> >
> > bt_dev_dbg(hdev, "err %d", err);
> >
> > - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, mgmt_status(err),
> > + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_status(err),
> > cmd->param, 1);
> > mgmt_pending_remove(cmd);
> >
> > @@ -6238,7 +6231,7 @@ static void set_advertising_complete(struct hci_dev *hdev, void *data, int err)
> > u8 status = mgmt_status(err);
> >
> > if (status) {
> > - mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev,
> > + mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev, true,
> > cmd_status_rsp, &status);
> > return;
> > }
> > @@ -6248,7 +6241,7 @@ static void set_advertising_complete(struct hci_dev *hdev, void *data, int err)
> > else
> > hci_dev_clear_flag(hdev, HCI_ADVERTISING);
> >
> > - mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev, settings_rsp,
> > + mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev, true, settings_rsp,
> > &match);
> >
> > new_settings(hdev, match.sk);
> > @@ -6592,7 +6585,7 @@ static void set_bredr_complete(struct hci_dev *hdev, void *data, int err)
> > */
> > hci_dev_clear_flag(hdev, HCI_BREDR_ENABLED);
> >
> > - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, mgmt_err);
> > + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_err);
> > } else {
> > send_settings_rsp(cmd->sk, MGMT_OP_SET_BREDR, hdev);
> > new_settings(hdev, cmd->sk);
> > @@ -6729,7 +6722,7 @@ static void set_secure_conn_complete(struct hci_dev *hdev, void *data, int err)
> > if (err) {
> > u8 mgmt_err = mgmt_status(err);
> >
> > - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, mgmt_err);
> > + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_err);
> > goto done;
> > }
> >
> > @@ -7176,7 +7169,7 @@ static void get_conn_info_complete(struct hci_dev *hdev, void *data, int err)
> > rp.max_tx_power = HCI_TX_POWER_INVALID;
> > }
> >
> > - mgmt_cmd_complete(cmd->sk, cmd->index, MGMT_OP_GET_CONN_INFO, status,
> > + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, MGMT_OP_GET_CONN_INFO, status,
> > &rp, sizeof(rp));
> >
> > mgmt_pending_free(cmd);
> > @@ -7336,7 +7329,7 @@ static void get_clock_info_complete(struct hci_dev *hdev, void *data, int err)
> > }
> >
> > complete:
> > - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, status, &rp,
> > + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, status, &rp,
> > sizeof(rp));
> >
> > mgmt_pending_free(cmd);
> > @@ -8586,10 +8579,10 @@ static void add_advertising_complete(struct hci_dev *hdev, void *data, int err)
> > rp.instance = cp->instance;
> >
> > if (err)
> > - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode,
> > + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode,
> > mgmt_status(err));
> > else
> > - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> > + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
> > mgmt_status(err), &rp, sizeof(rp));
> >
> > add_adv_complete(hdev, cmd->sk, cp->instance, err);
> > @@ -8777,10 +8770,10 @@ static void add_ext_adv_params_complete(struct hci_dev *hdev, void *data,
> >
> > hci_remove_adv_instance(hdev, cp->instance);
> >
> > - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode,
> > + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode,
> > mgmt_status(err));
> > } else {
> > - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> > + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
> > mgmt_status(err), &rp, sizeof(rp));
> > }
> >
> > @@ -8927,10 +8920,10 @@ static void add_ext_adv_data_complete(struct hci_dev *hdev, void *data, int err)
> > rp.instance = cp->instance;
> >
> > if (err)
> > - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode,
> > + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode,
> > mgmt_status(err));
> > else
> > - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> > + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
> > mgmt_status(err), &rp, sizeof(rp));
> >
> > mgmt_pending_free(cmd);
> > @@ -9089,10 +9082,10 @@ static void remove_advertising_complete(struct hci_dev *hdev, void *data,
> > rp.instance = cp->instance;
> >
> > if (err)
> > - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode,
> > + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode,
> > mgmt_status(err));
> > else
> > - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> > + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
> > MGMT_STATUS_SUCCESS, &rp, sizeof(rp));
> >
> > mgmt_pending_free(cmd);
> > @@ -9364,7 +9357,7 @@ void mgmt_index_removed(struct hci_dev *hdev)
> > if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
> > return;
> >
> > - mgmt_pending_foreach(0, hdev, cmd_complete_rsp, &match);
> > + mgmt_pending_foreach(0, hdev, true, cmd_complete_rsp, &match);
> >
> > if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
> > mgmt_index_event(MGMT_EV_UNCONF_INDEX_REMOVED, hdev, NULL, 0,
> > @@ -9402,7 +9395,8 @@ void mgmt_power_on(struct hci_dev *hdev, int err)
> > hci_update_passive_scan(hdev);
> > }
> >
> > - mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, settings_rsp, &match);
> > + mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, true, settings_rsp,
> > + &match);
> >
> > new_settings(hdev, match.sk);
> >
> > @@ -9417,7 +9411,8 @@ void __mgmt_power_off(struct hci_dev *hdev)
> > struct cmd_lookup match = { NULL, hdev };
> > u8 zero_cod[] = { 0, 0, 0 };
> >
> > - mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, settings_rsp, &match);
> > + mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, true, settings_rsp,
> > + &match);
> >
> > /* If the power off is because of hdev unregistration let
> > * use the appropriate INVALID_INDEX status. Otherwise use
> > @@ -9431,7 +9426,7 @@ void __mgmt_power_off(struct hci_dev *hdev)
> > else
> > match.mgmt_status = MGMT_STATUS_NOT_POWERED;
> >
> > - mgmt_pending_foreach(0, hdev, cmd_complete_rsp, &match);
> > + mgmt_pending_foreach(0, hdev, true, cmd_complete_rsp, &match);
> >
> > if (memcmp(hdev->dev_class, zero_cod, sizeof(zero_cod)) != 0) {
> > mgmt_limited_event(MGMT_EV_CLASS_OF_DEV_CHANGED, hdev,
> > @@ -9672,7 +9667,6 @@ static void unpair_device_rsp(struct mgmt_pending_cmd *cmd, void *data)
> > device_unpaired(hdev, &cp->addr.bdaddr, cp->addr.type, cmd->sk);
> >
> > cmd->cmd_complete(cmd, 0);
> > - mgmt_pending_remove(cmd);
> > }
> >
> > bool mgmt_powering_down(struct hci_dev *hdev)
> > @@ -9728,8 +9722,8 @@ void mgmt_disconnect_failed(struct hci_dev *hdev, bdaddr_t *bdaddr,
> > struct mgmt_cp_disconnect *cp;
> > struct mgmt_pending_cmd *cmd;
> >
> > - mgmt_pending_foreach(MGMT_OP_UNPAIR_DEVICE, hdev, unpair_device_rsp,
> > - hdev);
> > + mgmt_pending_foreach(MGMT_OP_UNPAIR_DEVICE, hdev, true,
> > + unpair_device_rsp, hdev);
> >
> > cmd = pending_find(MGMT_OP_DISCONNECT, hdev);
> > if (!cmd)
> > @@ -9922,7 +9916,7 @@ void mgmt_auth_enable_complete(struct hci_dev *hdev, u8 status)
> >
> > if (status) {
> > u8 mgmt_err = mgmt_status(status);
> > - mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev,
> > + mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev, true,
> > cmd_status_rsp, &mgmt_err);
> > return;
> > }
> > @@ -9932,8 +9926,8 @@ void mgmt_auth_enable_complete(struct hci_dev *hdev, u8 status)
> > else
> > changed = hci_dev_test_and_clear_flag(hdev, HCI_LINK_SECURITY);
> >
> > - mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev, settings_rsp,
> > - &match);
> > + mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev, true,
> > + settings_rsp, &match);
> >
> > if (changed)
> > new_settings(hdev, match.sk);
> > @@ -9957,9 +9951,12 @@ void mgmt_set_class_of_dev_complete(struct hci_dev *hdev, u8 *dev_class,
> > {
> > struct cmd_lookup match = { NULL, hdev, mgmt_status(status) };
> >
> > - mgmt_pending_foreach(MGMT_OP_SET_DEV_CLASS, hdev, sk_lookup, &match);
> > - mgmt_pending_foreach(MGMT_OP_ADD_UUID, hdev, sk_lookup, &match);
> > - mgmt_pending_foreach(MGMT_OP_REMOVE_UUID, hdev, sk_lookup, &match);
> > + mgmt_pending_foreach(MGMT_OP_SET_DEV_CLASS, hdev, false, sk_lookup,
> > + &match);
> > + mgmt_pending_foreach(MGMT_OP_ADD_UUID, hdev, false, sk_lookup,
> > + &match);
> > + mgmt_pending_foreach(MGMT_OP_REMOVE_UUID, hdev, false, sk_lookup,
> > + &match);
> >
> > if (!status) {
> > mgmt_limited_event(MGMT_EV_CLASS_OF_DEV_CHANGED, hdev, dev_class,
> > diff --git a/net/bluetooth/mgmt_util.c b/net/bluetooth/mgmt_util.c
> > index 3713ff490c65..a88a07da3947 100644
> > --- a/net/bluetooth/mgmt_util.c
> > +++ b/net/bluetooth/mgmt_util.c
> > @@ -217,30 +217,47 @@ int mgmt_cmd_complete(struct sock *sk, u16 index, u16 cmd, u8 status,

> > struct mgmt_pending_cmd *mgmt_pending_find(unsigned short channel, u16 opcode,

> > struct hci_dev *hdev)
> > {
> > - struct mgmt_pending_cmd *cmd;
> > + struct mgmt_pending_cmd *cmd, *tmp;

> >
> > - list_for_each_entry(cmd, &hdev->mgmt_pending, list) {

> > + mutex_lock(&hdev->mgmt_pending_lock);
> > +
> > + list_for_each_entry_safe(cmd, tmp, &hdev->mgmt_pending, list) {

> > if (hci_sock_get_channel(cmd->sk) != channel)
> > continue;
> > - if (cmd->opcode == opcode)
> > +
> > + if (cmd->opcode == opcode) {

> > + mutex_unlock(&hdev->mgmt_pending_lock);
> > return cmd;
> > + }
> > }
> >
> > + mutex_unlock(&hdev->mgmt_pending_lock);
> > +
> > return NULL;
> > }
> >
> > -void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev,
> > +void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev, bool remove,

> > void (*cb)(struct mgmt_pending_cmd *cmd, void *data),
> > void *data)
> > {

> > struct mgmt_pending_cmd *cmd, *tmp;
> >
> > + mutex_lock(&hdev->mgmt_pending_lock);
> > +

> > list_for_each_entry_safe(cmd, tmp, &hdev->mgmt_pending, list) {

> > if (opcode > 0 && cmd->opcode != opcode)

> > continue;
> >
> > + if (remove)
> > + list_del(&cmd->list);
> > +
> > cb(cmd, data);
> > +
> > + if (remove)
> > + mgmt_pending_free(cmd);
> > }
> > +
> > + mutex_unlock(&hdev->mgmt_pending_lock);

> > }
> >
> > struct mgmt_pending_cmd *mgmt_pending_new(struct sock *sk, u16 opcode,

> > @@ -254,7 +271,7 @@ struct mgmt_pending_cmd *mgmt_pending_new(struct sock *sk, u16 opcode,
> > return NULL;
> >
> > cmd->opcode = opcode;
> > - cmd->index = hdev->id;
> > + cmd->hdev = hdev;
> >
> > cmd->param = kmemdup(data, len, GFP_KERNEL);
> > if (!cmd->param) {
> > @@ -280,7 +297,9 @@ struct mgmt_pending_cmd *mgmt_pending_add(struct sock *sk, u16 opcode,
> > if (!cmd)
> > return NULL;
> >
> > + mutex_lock(&hdev->mgmt_pending_lock);
> > list_add_tail(&cmd->list, &hdev->mgmt_pending);
> > + mutex_unlock(&hdev->mgmt_pending_lock);
> >
> > return cmd;
> > }
> > @@ -294,7 +313,10 @@ void mgmt_pending_free(struct mgmt_pending_cmd *cmd)
> >
> > void mgmt_pending_remove(struct mgmt_pending_cmd *cmd)
> > {
> > + mutex_lock(&cmd->hdev->mgmt_pending_lock);
> > list_del(&cmd->list);
> > + mutex_unlock(&cmd->hdev->mgmt_pending_lock);
> > +
> > mgmt_pending_free(cmd);
> > }
> >
> > diff --git a/net/bluetooth/mgmt_util.h b/net/bluetooth/mgmt_util.h
> > index f2ba994ab1d8..024e51dd6937 100644
> > --- a/net/bluetooth/mgmt_util.h
> > +++ b/net/bluetooth/mgmt_util.h
> > @@ -33,7 +33,7 @@ struct mgmt_mesh_tx {
> > struct mgmt_pending_cmd {
> > struct list_head list;
> > u16 opcode;
> > - int index;
> > + struct hci_dev *hdev;
> > void *param;
> > size_t param_len;
> > struct sock *sk;
> > @@ -54,7 +54,7 @@ int mgmt_cmd_complete(struct sock *sk, u16 index, u16 cmd, u8 status,

> >
> > struct mgmt_pending_cmd *mgmt_pending_find(unsigned short channel, u16 opcode,

> > struct hci_dev *hdev);
> > -void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev,
> > +void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev, bool remove,

> > void (*cb)(struct mgmt_pending_cmd *cmd, void *data),

> > void *data);

> > struct mgmt_pending_cmd *mgmt_pending_add(struct sock *sk, u16 opcode,

syzbot

unread,

Jun 2, 2025, 2:45:15 PM6/2/25

to linux-...@vger.kernel.org, luiz....@gmail.com, syzkall...@googlegroups.com

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+0a7039...@syzkaller.appspotmail.com
Tested-by: syzbot+0a7039...@syzkaller.appspotmail.com

Tested on:

commit: d7fa1af5 Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci

console output: https://syzkaller.appspot.com/x/log.txt?x=136aac82580000

patch: https://syzkaller.appspot.com/x/patch.diff?x=1442ac82580000

syzbot

unread,

Jun 3, 2025, 4:32:12 PM6/3/25

to linux-...@vger.kernel.org, syzkall...@googlegroups.com

For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.

***

Subject: Re: [PATCH v4 2/2] Bluetooth: MGMT: Protect mgmt_pending list with its own lock
Author: luiz....@gmail.com

#syz test

On Tue, Jun 3, 2025 at 4:29 PM Luiz Augusto von Dentz

<luiz....@gmail.com> wrote:
>
> From: Luiz Augusto von Dentz <luiz.vo...@intel.com>
>
> This uses a mutex to protect from concurrent access of mgmt_pending
> list which can cause crashes like:
>

> Fixes: a380b6cff1a2 ("Bluetooth: Add generic mgmt helper API")

> Closes: https://syzkaller.appspot.com/bug?extid=0a7039d5d9986ff4ecec
> Closes: https://syzkaller.appspot.com/bug?extid=cc0cc52e7f43dc9e6df1
> Reported-by: syzbot+0a7039...@syzkaller.appspotmail.com

> Tested-by: syzbot+0a7039...@syzkaller.appspotmail.com
> Tested-by: syzbot+cc0cc5...@syzkaller.appspotmail.com
> Signed-off-by: Dmitry Antipov <dman...@yandex.ru>
> Signed-off-by: Luiz Augusto von Dentz <luiz.vo...@intel.com>
> ---
> include/net/bluetooth/hci_core.h | 1 +
> net/bluetooth/hci_core.c | 1 +
> net/bluetooth/mgmt.c | 101 +++++++++++++++----------------
> net/bluetooth/mgmt_util.c | 32 ++++++++--
> net/bluetooth/mgmt_util.h | 4 +-
> 5 files changed, 80 insertions(+), 59 deletions(-)
>
> diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h

> index 93fcb659f0d4..f7b1a9eb9543 100644

> --- a/include/net/bluetooth/hci_core.h
> +++ b/include/net/bluetooth/hci_core.h
> @@ -546,6 +546,7 @@ struct hci_dev {
> struct hci_conn_hash conn_hash;
>
> struct list_head mesh_pending;
> + struct mutex mgmt_pending_lock;
> struct list_head mgmt_pending;
> struct list_head reject_list;
> struct list_head accept_list;
> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c

> index aeda2e4557d5..487c045a7ba8 100644
> --- a/net/bluetooth/hci_core.c
> +++ b/net/bluetooth/hci_core.c
> @@ -2485,6 +2485,7 @@ struct hci_dev *hci_alloc_dev_priv(int sizeof_priv)

>
> mutex_init(&hdev->lock);
> mutex_init(&hdev->req_lock);
> + mutex_init(&hdev->mgmt_pending_lock);
>
> ida_init(&hdev->unset_handle_ida);
>
> diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c

> index feaeec2423ae..de7adb9a47f9 100644

> @@ -5186,7 +5179,7 @@ static void mgmt_add_adv_patterns_monitor_complete(struct hci_dev *hdev,

> hci_update_passive_scan(hdev);
> }
>
> - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
> mgmt_status(status), &rp, sizeof(rp));
> mgmt_pending_remove(cmd);
>

> @@ -5401,7 +5394,7 @@ static void mgmt_remove_adv_monitor_complete(struct hci_dev *hdev,

> hci_update_passive_scan(hdev);
> }
>
> - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
> mgmt_status(status), &rp, sizeof(rp));

> mgmt_pending_free(cmd);
>
> @@ -5777,7 +5770,7 @@ static void start_discovery_complete(struct hci_dev *hdev, void *data, int err)

> cmd != pending_find(MGMT_OP_START_SERVICE_DISCOVERY, hdev))
> return;
>
> - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, mgmt_status(err),
> + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_status(err),
> cmd->param, 1);
> mgmt_pending_remove(cmd);
>

> @@ -5998,7 +5991,7 @@ static void stop_discovery_complete(struct hci_dev *hdev, void *data, int err)

>
> bt_dev_dbg(hdev, "err %d", err);
>
> - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, mgmt_status(err),
> + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_status(err),
> cmd->param, 1);
> mgmt_pending_remove(cmd);
>

> @@ -6223,7 +6216,7 @@ static void set_advertising_complete(struct hci_dev *hdev, void *data, int err)

> u8 status = mgmt_status(err);
>
> if (status) {
> - mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev,
> + mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev, true,
> cmd_status_rsp, &status);
> return;
> }

> @@ -6233,7 +6226,7 @@ static void set_advertising_complete(struct hci_dev *hdev, void *data, int err)

> else
> hci_dev_clear_flag(hdev, HCI_ADVERTISING);
>
> - mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev, settings_rsp,
> + mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev, true, settings_rsp,
> &match);
>
> new_settings(hdev, match.sk);

> @@ -6577,7 +6570,7 @@ static void set_bredr_complete(struct hci_dev *hdev, void *data, int err)

> */
> hci_dev_clear_flag(hdev, HCI_BREDR_ENABLED);
>
> - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, mgmt_err);
> + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_err);
> } else {
> send_settings_rsp(cmd->sk, MGMT_OP_SET_BREDR, hdev);
> new_settings(hdev, cmd->sk);

> @@ -6714,7 +6707,7 @@ static void set_secure_conn_complete(struct hci_dev *hdev, void *data, int err)

> if (err) {
> u8 mgmt_err = mgmt_status(err);
>
> - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, mgmt_err);
> + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_err);
> goto done;
> }
>

> @@ -7161,7 +7154,7 @@ static void get_conn_info_complete(struct hci_dev *hdev, void *data, int err)

> rp.max_tx_power = HCI_TX_POWER_INVALID;
> }
>
> - mgmt_cmd_complete(cmd->sk, cmd->index, MGMT_OP_GET_CONN_INFO, status,
> + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, MGMT_OP_GET_CONN_INFO, status,
> &rp, sizeof(rp));
>
> mgmt_pending_free(cmd);

> @@ -7321,7 +7314,7 @@ static void get_clock_info_complete(struct hci_dev *hdev, void *data, int err)

> }
>
> complete:
> - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, status, &rp,
> + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, status, &rp,
> sizeof(rp));
>
> mgmt_pending_free(cmd);

> @@ -8571,10 +8564,10 @@ static void add_advertising_complete(struct hci_dev *hdev, void *data, int err)

> rp.instance = cp->instance;
>
> if (err)
> - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode,
> + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode,
> mgmt_status(err));
> else
> - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
> mgmt_status(err), &rp, sizeof(rp));
>
> add_adv_complete(hdev, cmd->sk, cp->instance, err);

> @@ -8762,10 +8755,10 @@ static void add_ext_adv_params_complete(struct hci_dev *hdev, void *data,

>
> hci_remove_adv_instance(hdev, cp->instance);
>
> - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode,
> + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode,
> mgmt_status(err));
> } else {
> - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
> mgmt_status(err), &rp, sizeof(rp));
> }
>

> @@ -8912,10 +8905,10 @@ static void add_ext_adv_data_complete(struct hci_dev *hdev, void *data, int err)

> @@ -9074,10 +9067,10 @@ static void remove_advertising_complete(struct hci_dev *hdev, void *data,

> rp.instance = cp->instance;
>
> if (err)
> - mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode,
> + mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode,
> mgmt_status(err));
> else
> - mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> + mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
> MGMT_STATUS_SUCCESS, &rp, sizeof(rp));
>
> mgmt_pending_free(cmd);

> @@ -9349,7 +9342,7 @@ void mgmt_index_removed(struct hci_dev *hdev)

> if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
> return;
>
> - mgmt_pending_foreach(0, hdev, cmd_complete_rsp, &match);
> + mgmt_pending_foreach(0, hdev, true, cmd_complete_rsp, &match);
>
> if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
> mgmt_index_event(MGMT_EV_UNCONF_INDEX_REMOVED, hdev, NULL, 0,

> @@ -9387,7 +9380,8 @@ void mgmt_power_on(struct hci_dev *hdev, int err)

> hci_update_passive_scan(hdev);
> }
>
> - mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, settings_rsp, &match);
> + mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, true, settings_rsp,
> + &match);
>
> new_settings(hdev, match.sk);
>

> @@ -9402,7 +9396,8 @@ void __mgmt_power_off(struct hci_dev *hdev)

> struct cmd_lookup match = { NULL, hdev };
> u8 zero_cod[] = { 0, 0, 0 };
>
> - mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, settings_rsp, &match);
> + mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, true, settings_rsp,
> + &match);
>
> /* If the power off is because of hdev unregistration let
> * use the appropriate INVALID_INDEX status. Otherwise use

> @@ -9416,7 +9411,7 @@ void __mgmt_power_off(struct hci_dev *hdev)

> else
> match.mgmt_status = MGMT_STATUS_NOT_POWERED;
>
> - mgmt_pending_foreach(0, hdev, cmd_complete_rsp, &match);
> + mgmt_pending_foreach(0, hdev, true, cmd_complete_rsp, &match);
>
> if (memcmp(hdev->dev_class, zero_cod, sizeof(zero_cod)) != 0) {
> mgmt_limited_event(MGMT_EV_CLASS_OF_DEV_CHANGED, hdev,

> @@ -9657,7 +9652,6 @@ static void unpair_device_rsp(struct mgmt_pending_cmd *cmd, void *data)

> device_unpaired(hdev, &cp->addr.bdaddr, cp->addr.type, cmd->sk);
>
> cmd->cmd_complete(cmd, 0);
> - mgmt_pending_remove(cmd);
> }
>
> bool mgmt_powering_down(struct hci_dev *hdev)

> @@ -9713,8 +9707,8 @@ void mgmt_disconnect_failed(struct hci_dev *hdev, bdaddr_t *bdaddr,

> struct mgmt_cp_disconnect *cp;
> struct mgmt_pending_cmd *cmd;
>
> - mgmt_pending_foreach(MGMT_OP_UNPAIR_DEVICE, hdev, unpair_device_rsp,
> - hdev);
> + mgmt_pending_foreach(MGMT_OP_UNPAIR_DEVICE, hdev, true,
> + unpair_device_rsp, hdev);
>
> cmd = pending_find(MGMT_OP_DISCONNECT, hdev);
> if (!cmd)

> @@ -9907,7 +9901,7 @@ void mgmt_auth_enable_complete(struct hci_dev *hdev, u8 status)

>
> if (status) {
> u8 mgmt_err = mgmt_status(status);
> - mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev,
> + mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev, true,
> cmd_status_rsp, &mgmt_err);
> return;
> }

> @@ -9917,8 +9911,8 @@ void mgmt_auth_enable_complete(struct hci_dev *hdev, u8 status)

> else
> changed = hci_dev_test_and_clear_flag(hdev, HCI_LINK_SECURITY);
>
> - mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev, settings_rsp,
> - &match);
> + mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev, true,
> + settings_rsp, &match);
>
> if (changed)
> new_settings(hdev, match.sk);

> @@ -9942,9 +9936,12 @@ void mgmt_set_class_of_dev_complete(struct hci_dev *hdev, u8 *dev_class,

syzbot

unread,

Jun 3, 2025, 5:07:05 PM6/3/25

to linux-...@vger.kernel.org, luiz....@gmail.com, syzkall...@googlegroups.com

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+0a7039...@syzkaller.appspotmail.com
Tested-by: syzbot+0a7039...@syzkaller.appspotmail.com

Tested on:

commit: d7fa1af5 Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci

console output: https://syzkaller.appspot.com/x/log.txt?x=109b3c82580000

patch: https://syzkaller.appspot.com/x/patch.diff?x=14844570580000

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