[syzbot] [input?] [usb?] KASAN: slab-use-after-free Read in hidraw_report_event

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Apr 26, 2026, 11:28:34 PM (12 hours ago) Apr 26

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

Hello,

syzbot found the following issue on:

HEAD commit: 7080e32d3f09 Add linux-next specific files for 20260424
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13d8b2d2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d941ac7f11ceb230
dashboard link: https://syzkaller.appspot.com/bug?extid=9eebf5f6544c5e873858
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d309ba580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13a082ce580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9bbfdd86f73d/disk-7080e32d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1257e4300d9e/vmlinux-7080e32d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c2588b431811/bzImage-7080e32d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9eebf5...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
Read of size 1 at addr ffff888039a26d08 by task ktimers/0/16

CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description+0x55/0x1e0 mm/kasan/report.c:378
print_report+0x58/0x70 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
__kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire+0x84/0x350 kernel/locking/lockdep.c:5844
rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
spin_lock include/linux/spinlock_rt.h:45 [inline]
hidraw_report_event+0x5d/0x3a0 drivers/hid/hidraw.c:577
hid_report_raw_event+0x311/0x1730 drivers/hid/hid-core.c:2076
__hid_input_report drivers/hid/hid-core.c:2152 [inline]
hid_input_report+0x44e/0x580 drivers/hid/hid-core.c:2174
hid_irq_in+0x47e/0x6d0 drivers/hid/usbhid/hid-core.c:286
__usb_hcd_giveback_urb+0x3b3/0x5e0 drivers/usb/core/hcd.c:1657
dummy_timer+0x8a9/0x47d0 drivers/usb/gadget/udc/dummy_hcd.c:2005
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x405/0xb10 kernel/time/hrtimer.c:1994
hrtimer_run_softirq+0x18f/0x260 kernel/time/hrtimer.c:2011
handle_softirqs+0x1de/0x6d0 kernel/softirq.c:626
__do_softirq kernel/softirq.c:660 [inline]
run_ktimerd+0x69/0x100 kernel/softirq.c:1155
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>

Allocated by task 10:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x3a6/0x690 mm/slub.c:5415
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
hidraw_connect+0x57/0x430 drivers/hid/hidraw.c:606
hid_connect+0x5bf/0x19d0 drivers/hid/hid-core.c:2277
hid_hw_start+0xa8/0x120 drivers/hid/hid-core.c:2387
corsairpsu_probe+0xd9/0x3c0 drivers/hwmon/corsair-psu.c:782
__hid_device_probe drivers/hid/hid-core.c:2783 [inline]
hid_device_probe+0x416/0x7a0 drivers/hid/hid-core.c:2820
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:709
__driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871
driver_probe_device+0x4f/0x240 drivers/base/dd.c:901
__device_attach_driver+0x279/0x430 drivers/base/dd.c:1029
bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c8/0x450 drivers/base/dd.c:1101
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156
bus_probe_device+0x12d/0x220 drivers/base/bus.c:613
device_add+0x7e9/0xbb0 drivers/base/core.c:3706
hid_add_device+0x272/0x3e0 drivers/hid/hid-core.c:2964
usbhid_probe+0xbb3/0x1080 drivers/hid/usbhid/hid-core.c:1448
usb_probe_interface+0x659/0xc70 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:709
__driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871
driver_probe_device+0x4f/0x240 drivers/base/dd.c:901
__device_attach_driver+0x279/0x430 drivers/base/dd.c:1029
bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c8/0x450 drivers/base/dd.c:1101
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156
bus_probe_device+0x12d/0x220 drivers/base/bus.c:613
device_add+0x7e9/0xbb0 drivers/base/core.c:3706
usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2268
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:709
__driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871
driver_probe_device+0x4f/0x240 drivers/base/dd.c:901
__device_attach_driver+0x279/0x430 drivers/base/dd.c:1029
bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c8/0x450 drivers/base/dd.c:1101
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156
bus_probe_device+0x12d/0x220 drivers/base/bus.c:613
device_add+0x7e9/0xbb0 drivers/base/core.c:3706
usb_new_device+0x9f8/0x16e0 drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x2a49/0x4f60 drivers/usb/core/hub.c:5953
process_one_work+0x9a3/0x1710 kernel/workqueue.c:3312
process_scheduled_works kernel/workqueue.c:3403 [inline]
worker_thread+0xba8/0x11e0 kernel/workqueue.c:3489
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 10:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2689 [inline]
slab_free mm/slub.c:6246 [inline]
kfree+0x1c5/0x6c0 mm/slub.c:6561
hidraw_disconnect+0x4f/0x60 drivers/hid/hidraw.c:662
hid_disconnect drivers/hid/hid-core.c:2362 [inline]
hid_hw_stop+0x101/0x1e0 drivers/hid/hid-core.c:2407
corsairpsu_probe+0x327/0x3c0 drivers/hwmon/corsair-psu.c:826
__hid_device_probe drivers/hid/hid-core.c:2783 [inline]
hid_device_probe+0x416/0x7a0 drivers/hid/hid-core.c:2820
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:709
__driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871
driver_probe_device+0x4f/0x240 drivers/base/dd.c:901
__device_attach_driver+0x279/0x430 drivers/base/dd.c:1029
bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c8/0x450 drivers/base/dd.c:1101
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156
bus_probe_device+0x12d/0x220 drivers/base/bus.c:613
device_add+0x7e9/0xbb0 drivers/base/core.c:3706
hid_add_device+0x272/0x3e0 drivers/hid/hid-core.c:2964
usbhid_probe+0xbb3/0x1080 drivers/hid/usbhid/hid-core.c:1448
usb_probe_interface+0x659/0xc70 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:709
__driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871
driver_probe_device+0x4f/0x240 drivers/base/dd.c:901
__device_attach_driver+0x279/0x430 drivers/base/dd.c:1029
bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c8/0x450 drivers/base/dd.c:1101
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156
bus_probe_device+0x12d/0x220 drivers/base/bus.c:613
device_add+0x7e9/0xbb0 drivers/base/core.c:3706
usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2268
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:709
__driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871
driver_probe_device+0x4f/0x240 drivers/base/dd.c:901
__device_attach_driver+0x279/0x430 drivers/base/dd.c:1029
bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c8/0x450 drivers/base/dd.c:1101
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156
bus_probe_device+0x12d/0x220 drivers/base/bus.c:613
device_add+0x7e9/0xbb0 drivers/base/core.c:3706
usb_new_device+0x9f8/0x16e0 drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x2a49/0x4f60 drivers/usb/core/hub.c:5953
process_one_work+0x9a3/0x1710 kernel/workqueue.c:3312
process_scheduled_works kernel/workqueue.c:3403 [inline]
worker_thread+0xba8/0x11e0 kernel/workqueue.c:3489
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888039a26c00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 264 bytes inside of
freed 512-byte region [ffff888039a26c00, ffff888039a26e00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x39a24
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff88813fe14c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 0080000000000040 ffff88813fe14c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 0080000000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5865, tgid 5865 (syz-executor), ts 158390292947, free_ts 156250708543
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1858
prep_new_page mm/page_alloc.c:1866 [inline]
get_page_from_freelist+0x27d6/0x2850 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226
alloc_slab_page mm/slub.c:3278 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3467
new_slab mm/slub.c:3525 [inline]
refill_objects+0x33c/0x3d0 mm/slub.c:7251
refill_sheaf mm/slub.c:2816 [inline]
__pcs_replace_empty_main+0x373/0x720 mm/slub.c:4651
alloc_from_pcs mm/slub.c:4749 [inline]
slab_alloc_node mm/slub.c:4883 [inline]
__kmalloc_cache_noprof+0x44e/0x690 mm/slub.c:5410
kmalloc_noprof include/linux/slab.h:950 [inline]
tc_action_net_init include/net/act_api.h:163 [inline]
nat_init_net+0x65/0x1a0 net/sched/act_nat.c:332
ops_init+0x35c/0x5c0 net/core/net_namespace.c:137
setup_net+0x118/0x340 net/core/net_namespace.c:446
copy_net_ns+0x50e/0x730 net/core/net_namespace.c:579
create_new_namespaces+0x3e7/0x6a0 kernel/nsproxy.c:132
unshare_nsproxy_namespaces+0x149/0x190 kernel/nsproxy.c:234
ksys_unshare+0x57d/0x9f0 kernel/fork.c:3244
__do_sys_unshare kernel/fork.c:3318 [inline]
__se_sys_unshare kernel/fork.c:3316 [inline]
__x64_sys_unshare+0x38/0x50 kernel/fork.c:3316
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
page last free pid 5848 tgid 5848 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1402 [inline]
__free_frozen_pages+0xf9b/0x10f0 mm/page_alloc.c:2943
__folio_put+0x2eb/0x3a0 mm/swap.c:112
folio_put include/linux/mm.h:2090 [inline]
put_page include/linux/mm.h:2159 [inline]
put_netmem include/net/netmem.h:394 [inline]
skb_page_unref include/linux/skbuff_ref.h:43 [inline]
__skb_frag_unref include/linux/skbuff_ref.h:56 [inline]
skb_release_data+0x544/0xa60 net/core/skbuff.c:1108
skb_release_all net/core/skbuff.c:1189 [inline]
__kfree_skb+0x5d/0x210 net/core/skbuff.c:1203
tcp_clean_rtx_queue net/ipv4/tcp_input.c:3698 [inline]
tcp_ack+0x284f/0x7e00 net/ipv4/tcp_input.c:4370
tcp_rcv_established+0x8c4/0x2800 net/ipv4/tcp_input.c:6645
tcp_v4_do_rcv+0x755/0x13f0 net/ipv4/tcp_ipv4.c:1852
sk_backlog_rcv include/net/sock.h:1190 [inline]
__release_sock+0x285/0x3d0 net/core/sock.c:3216
__sk_flush_backlog+0x4b/0xe0 net/core/sock.c:3239
sk_flush_backlog include/net/sock.h:1253 [inline]
tcp_sendmsg_locked+0x4167/0x5370 net/ipv4/tcp.c:1256
tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1455
sock_sendmsg_nosec+0xf9/0x150 net/socket.c:797
__sock_sendmsg net/socket.c:812 [inline]
sock_write_iter+0x308/0x410 net/socket.c:1269
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x629/0xba0 fs/read_write.c:688
ksys_write+0x156/0x270 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94

Memory state around the buggy address:
ffff888039a26c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888039a26c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888039a26d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888039a26d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888039a26e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

---
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:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Edward Adam Davis

unread,

1:05 AM (10 hours ago) 1:05 AM

to syzbot+9eebf5...@syzkaller.appspotmail.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com

#syz test

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 61afec5915ec..0b588e002834 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2353,14 +2353,16 @@ EXPORT_SYMBOL_GPL(hid_connect);

void hid_disconnect(struct hid_device *hdev)
{
+ unsigned claimed = hdev->claimed;
+ hdev->claimed = 0;
+
device_remove_file(&hdev->dev, &dev_attr_country);
- if (hdev->claimed & HID_CLAIMED_INPUT)
+ if (claimed & HID_CLAIMED_INPUT)
hidinput_disconnect(hdev);
- if (hdev->claimed & HID_CLAIMED_HIDDEV)
+ if (claimed & HID_CLAIMED_HIDDEV)
hdev->hiddev_disconnect(hdev);
- if (hdev->claimed & HID_CLAIMED_HIDRAW)
+ if (claimed & HID_CLAIMED_HIDRAW)
hidraw_disconnect(hdev);
- hdev->claimed = 0;

hid_bpf_disconnect_device(hdev);
}

syzbot

unread,

2:03 AM (9 hours ago) 2:03 AM

to ead...@qq.com, 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+9eebf5...@syzkaller.appspotmail.com
Tested-by: syzbot+9eebf5...@syzkaller.appspotmail.com

Tested on:

commit: 7080e32d Add linux-next specific files for 20260424
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11852348580000

kernel config: https://syzkaller.appspot.com/x/.config?x=d941ac7f11ceb230
dashboard link: https://syzkaller.appspot.com/bug?extid=9eebf5f6544c5e873858
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

patch: https://syzkaller.appspot.com/x/patch.diff?x=1744b2d2580000

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

Edward Adam Davis

unread,

5:18 AM (6 hours ago) 5:18 AM

to syzbot+9eebf5...@syzkaller.appspotmail.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com

#syz test

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c

index 0b588e002834..8739f794d80a 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2144,12 +2144,18 @@ static int __hid_input_report(struct hid_device *hid, enum hid_report_type type,
}

if (hdrv && hdrv->raw_event && hid_match_report(hid, report)) {
+ printk("before psu raw event, hid: %p claimed: %u, size: %u, "
+ "data: %p, %s\n", hid, hid->claimed, size, data,
+ __func__);
ret = hdrv->raw_event(hid, report, data, size);
+ printk("after psu raw event, hid: %p claimed: %u, %s\n",
+ hid, hid->claimed, __func__);
if (ret < 0)
goto unlock;
}

ret = hid_report_raw_event(hid, type, data, size, interrupt);
+ printk("after report raw event, hid: %p, %s\n", hid, __func__);

unlock:
if (!lock_already_taken)
@@ -2818,8 +2824,11 @@ static int hid_device_probe(struct device *dev)
hdev->io_started = false;
clear_bit(ffs(HID_STAT_REPROBED), &hdev->status);

- if (!hdev->driver)
+ if (!hdev->driver) {
+ printk("before hid dev probe, hid: %p, %s\n", hdev, __func__);
ret = __hid_device_probe(hdev, hdrv);
+ printk("after hid dev probe, hid: %p, %s\n", hdev, __func__);
+ }

if (!hdev->io_started)
up(&hdev->driver_input_lock);

syzbot

unread,

8:49 AM (3 hours ago) 8:49 AM

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

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Read in hidraw_report_event

before psu raw event, hid: ffff88805fe30000 claimed: 4, size: 1, data: ffff888046630000, __hid_input_report
after psu raw event, hid: ffff88805fe30000 claimed: 4, __hid_input_report

==================================================================
BUG: KASAN: slab-use-after-free in rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56

Read of size 1 at addr ffff88805d993108 by task ktimers/1/30

CPU: 1 UID: 0 PID: 30 Comm: ktimers/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)}

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description+0x55/0x1e0 mm/kasan/report.c:378
print_report+0x58/0x70 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
__kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire+0x84/0x350 kernel/locking/lockdep.c:5844
rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
spin_lock include/linux/spinlock_rt.h:45 [inline]
hidraw_report_event+0x5d/0x3a0 drivers/hid/hidraw.c:577
hid_report_raw_event+0x311/0x1730 drivers/hid/hid-core.c:2076

__hid_input_report drivers/hid/hid-core.c:2157 [inline]
hid_input_report+0x2ff/0x660 drivers/hid/hid-core.c:2180

hid_irq_in+0x47e/0x6d0 drivers/hid/usbhid/hid-core.c:286
__usb_hcd_giveback_urb+0x3b3/0x5e0 drivers/usb/core/hcd.c:1657
dummy_timer+0x8a9/0x47d0 drivers/usb/gadget/udc/dummy_hcd.c:2005
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x405/0xb10 kernel/time/hrtimer.c:1994
hrtimer_run_softirq+0x18f/0x260 kernel/time/hrtimer.c:2011
handle_softirqs+0x1de/0x6d0 kernel/softirq.c:626
__do_softirq kernel/softirq.c:660 [inline]
run_ktimerd+0x69/0x100 kernel/softirq.c:1155
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>

Allocated by task 5930:

hid_connect+0x5bf/0x19d0 drivers/hid/hid-core.c:2283
hid_hw_start+0xa8/0x120 drivers/hid/hid-core.c:2393
corsairpsu_probe+0xd9/0x3c0 drivers/hwmon/corsair-psu.c:782
__hid_device_probe drivers/hid/hid-core.c:2789 [inline]
hid_device_probe+0x5ec/0x810 drivers/hid/hid-core.c:2827

call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:709
__driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871
driver_probe_device+0x4f/0x240 drivers/base/dd.c:901
__device_attach_driver+0x279/0x430 drivers/base/dd.c:1029
bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
__device_attach+0x2c8/0x450 drivers/base/dd.c:1101
device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156
bus_probe_device+0x12d/0x220 drivers/base/bus.c:613
device_add+0x7e9/0xbb0 drivers/base/core.c:3706

hid_add_device+0x272/0x3e0 drivers/hid/hid-core.c:2973

Freed by task 5930:

kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2689 [inline]
slab_free mm/slub.c:6246 [inline]
kfree+0x1c5/0x6c0 mm/slub.c:6561
hidraw_disconnect+0x4f/0x60 drivers/hid/hidraw.c:662

hid_disconnect drivers/hid/hid-core.c:2368 [inline]
hid_hw_stop+0x101/0x1e0 drivers/hid/hid-core.c:2413
corsairpsu_probe+0x327/0x3c0 drivers/hwmon/corsair-psu.c:826
__hid_device_probe drivers/hid/hid-core.c:2789 [inline]
hid_device_probe+0x5ec/0x810 drivers/hid/hid-core.c:2827

hid_add_device+0x272/0x3e0 drivers/hid/hid-core.c:2973

The buggy address belongs to the object at ffff88805d993000

which belongs to the cache kmalloc-512 of size 512
The buggy address is located 264 bytes inside of

freed 512-byte region [ffff88805d993000, ffff88805d993200)

The buggy address belongs to the physical page:

page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5d990

head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff88813fe14c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 0080000000000040 ffff88813fe14c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 0080000000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated

set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1858
prep_new_page mm/page_alloc.c:1866 [inline]
get_page_from_freelist+0x27d6/0x2850 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5226
alloc_slab_page mm/slub.c:3278 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3467
new_slab mm/slub.c:3525 [inline]
refill_objects+0x33c/0x3d0 mm/slub.c:7251
refill_sheaf mm/slub.c:2816 [inline]
__pcs_replace_empty_main+0x373/0x720 mm/slub.c:4651
alloc_from_pcs mm/slub.c:4749 [inline]
slab_alloc_node mm/slub.c:4883 [inline]
__kmalloc_cache_noprof+0x44e/0x690 mm/slub.c:5410
kmalloc_noprof include/linux/slab.h:950 [inline]

kzalloc_noprof include/linux/slab.h:1188 [inline]
mca_alloc net/ipv6/mcast.c:871 [inline]
__ipv6_dev_mc_inc+0x44f/0xa50 net/ipv6/mcast.c:961
ipv6_add_dev+0xe9f/0x1410 net/ipv6/addrconf.c:475
addrconf_notify+0x771/0x1050 net/ipv6/addrconf.c:3662
notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
call_netdevice_notifiers net/core/dev.c:2302 [inline]
register_netdevice+0x18d5/0x1ed0 net/core/dev.c:11466
register_netdev+0x40/0x60 net/core/dev.c:11544
sit_init_net+0x228/0x5d0 net/ipv6/sit.c:1860

ops_init+0x35c/0x5c0 net/core/net_namespace.c:137
setup_net+0x118/0x340 net/core/net_namespace.c:446

page last free pid 6296 tgid 6296 stack trace:

reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1402 [inline]
__free_frozen_pages+0xf9b/0x10f0 mm/page_alloc.c:2943

__slab_free+0x252/0x2a0 mm/slub.c:5608
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4569 [inline]
slab_alloc_node mm/slub.c:4898 [inline]
__do_kmalloc_node mm/slub.c:5294 [inline]
__kmalloc_node_track_caller_noprof+0x323/0x7e0 mm/slub.c:5403
kmemdup_noprof+0x2b/0x70 mm/util.c:138
kmemdup_noprof include/linux/fortify-string.h:763 [inline]
neigh_sysctl_register+0xae/0xa90 net/core/neighbour.c:3861
addrconf_sysctl_register+0xb3/0x1c0 net/ipv6/addrconf.c:7379
ipv6_add_dev+0xd82/0x1410 net/ipv6/addrconf.c:460
addrconf_notify+0x771/0x1050 net/ipv6/addrconf.c:3662
notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
call_netdevice_notifiers net/core/dev.c:2302 [inline]
register_netdevice+0x18d5/0x1ed0 net/core/dev.c:11466
veth_newlink+0x67b/0xb70 drivers/net/veth.c:1889
rtnl_newlink_create+0x329/0xb70 net/core/rtnetlink.c:3863
__rtnl_newlink net/core/rtnetlink.c:3994 [inline]
rtnl_newlink+0x166a/0x1bb0 net/core/rtnetlink.c:4109

Memory state around the buggy address:

ffff88805d993000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805d993080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88805d993100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805d993180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805d993200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Tested on:

commit: 7080e32d Add linux-next specific files for 20260424
git tree: linux-next

console output: https://syzkaller.appspot.com/x/log.txt?x=131d92ce580000

patch: https://syzkaller.appspot.com/x/patch.diff?x=12fe4506580000

Edward Adam Davis

unread,

9:11 AM (2 hours ago) 9:11 AM

to syzbot+9eebf5...@syzkaller.appspotmail.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com

#syz test

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c

index 0b588e002834..a688f5edf9fb 100644

--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2144,12 +2144,18 @@ static int __hid_input_report(struct hid_device *hid, enum hid_report_type type,
}

if (hdrv && hdrv->raw_event && hid_match_report(hid, report)) {
+ printk("before psu raw event, hid: %p claimed: %u, size: %u, "

+ "data: %p, lk (%p) cnt: %u, %s\n", hid, hid->claimed, size, data,
+ &hid->driver_input_lock,
+ hid->driver_input_lock.count,

+ __func__);
ret = hdrv->raw_event(hid, report, data, size);

if (ret < 0)
goto unlock;
}

ret = hid_report_raw_event(hid, type, data, size, interrupt);

+ printk("after report raw event, hid: %p, ret: %d, %s\n", hid, ret, __func__);

unlock:
if (!lock_already_taken)
@@ -2818,8 +2824,15 @@ static int hid_device_probe(struct device *dev)

hdev->io_started = false;
clear_bit(ffs(HID_STAT_REPROBED), &hdev->status);

- if (!hdev->driver)
+ if (!hdev->driver) {

+ printk("before hid dev probe, hid: %p claimed: %u, lk (%p) cnt: %u, %s\n",
+ hdev, hdev->claimed,
+ &hdev->driver_input_lock,
+ hdev->driver_input_lock.count,
+ __func__);
ret = __hid_device_probe(hdev, hdrv);
+ printk("after hid dev probe, hid: %p claimed: %u, ret: %d, %s\n", hdev, hdev->claimed, ret, __func__);

+ }

if (!hdev->io_started)
up(&hdev->driver_input_lock);

@@ -3002,6 +3015,11 @@ struct hid_device *hid_allocate_device(void)
INIT_LIST_HEAD(&hdev->debug_list);
spin_lock_init(&hdev->debug_list_lock);
sema_init(&hdev->driver_input_lock, 1);
+ printk("before psu raw event, hid: %p claimed: %u, "
+ "lk (%p) cnt: %u, %s\n", hdev, hdev->claimed,
+ &hdev->driver_input_lock,
+ hdev->driver_input_lock.count,
+ __func__);
mutex_init(&hdev->ll_open_lock);
kref_init(&hdev->ref);

syzbot

unread,

10:09 AM (1 hour ago) 10:09 AM

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

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Read in hidraw_report_event

before psu raw event, hid: ffff8880398f0000 claimed: 4, size: 1, data: ffff88803b938000, lk (ffff8880398f18e0) cnt: 0, __hid_input_report

==================================================================
BUG: KASAN: slab-use-after-free in rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56

Read of size 1 at addr ffff888042804908 by task ktimers/1/30

CPU: 1 UID: 0 PID: 30 Comm: ktimers/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description+0x55/0x1e0 mm/kasan/report.c:378
print_report+0x58/0x70 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
__kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire+0x84/0x350 kernel/locking/lockdep.c:5844
rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
spin_lock include/linux/spinlock_rt.h:45 [inline]
hidraw_report_event+0x5d/0x3a0 drivers/hid/hidraw.c:577
hid_report_raw_event+0x311/0x1730 drivers/hid/hid-core.c:2076
__hid_input_report drivers/hid/hid-core.c:2157 [inline]

hid_input_report+0x2ea/0x630 drivers/hid/hid-core.c:2180

Allocated by task 6609:

kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x3a6/0x690 mm/slub.c:5415
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
hidraw_connect+0x57/0x430 drivers/hid/hidraw.c:606
hid_connect+0x5bf/0x19d0 drivers/hid/hid-core.c:2283
hid_hw_start+0xa8/0x120 drivers/hid/hid-core.c:2393
corsairpsu_probe+0xd9/0x3c0 drivers/hwmon/corsair-psu.c:782
__hid_device_probe drivers/hid/hid-core.c:2789 [inline]

hid_device_probe+0x65b/0x8e0 drivers/hid/hid-core.c:2831

hid_add_device+0x272/0x3e0 drivers/hid/hid-core.c:2977

The buggy address belongs to the object at ffff888042804800

which belongs to the cache kmalloc-512 of size 512
The buggy address is located 264 bytes inside of

freed 512-byte region [ffff888042804800, ffff888042804a00)

The buggy address belongs to the physical page:

page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42804

rxrpc_alloc_peer+0x7d/0x340 net/rxrpc/peer_object.c:229
rxrpc_service_prealloc_one+0x1f4/0xe20 net/rxrpc/call_accept.c:73
afs_charge_preallocation+0x394/0x4e0 fs/afs/rxrpc.c:758
afs_open_socket+0x33c/0x3f0 fs/afs/rxrpc.c:112
afs_net_init+0x6ce/0x8f0 fs/afs/main.c:116

ops_init+0x35c/0x5c0 net/core/net_namespace.c:137
setup_net+0x118/0x340 net/core/net_namespace.c:446

copy_net_ns+0x50e/0x730 net/core/net_namespace.c:579
create_new_namespaces+0x3e7/0x6a0 kernel/nsproxy.c:132

page last free pid 32 tgid 32 stack trace:

reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1402 [inline]
__free_frozen_pages+0xf9b/0x10f0 mm/page_alloc.c:2943

kasan_depopulate_vmalloc_pte+0x6d/0x90 mm/kasan/shadow.c:484
apply_to_pte_range mm/memory.c:3322 [inline]
apply_to_pmd_range mm/memory.c:3366 [inline]
apply_to_pud_range mm/memory.c:3402 [inline]
apply_to_p4d_range mm/memory.c:3438 [inline]
__apply_to_page_range+0xbdc/0x1420 mm/memory.c:3474
__kasan_release_vmalloc+0xa2/0xd0 mm/kasan/shadow.c:602
kasan_release_vmalloc include/linux/kasan.h:593 [inline]
kasan_release_vmalloc_node mm/vmalloc.c:2284 [inline]
purge_vmap_node+0x220/0x960 mm/vmalloc.c:2306
__purge_vmap_area_lazy+0x779/0xb40 mm/vmalloc.c:2396
drain_vmap_area_work+0x27/0x40 mm/vmalloc.c:2430

process_one_work+0x9a3/0x1710 kernel/workqueue.c:3312
process_scheduled_works kernel/workqueue.c:3403 [inline]
worker_thread+0xba8/0x11e0 kernel/workqueue.c:3489
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:

ffff888042804800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888042804880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888042804900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888042804980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888042804a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc

==================================================================

Tested on:

commit: 7080e32d Add linux-next specific files for 20260424
git tree: linux-next

console output: https://syzkaller.appspot.com/x/log.txt?x=14d46b6c580000

patch: https://syzkaller.appspot.com/x/patch.diff?x=1086916a580000

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