[syzbot] [wireless?] general protection fault in cfg80211_mlme_deauth

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 0af2f6be1b42 Linux 6.15-rc1
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1284523f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=66996a2350ef05e0
dashboard link: https://syzkaller.appspot.com/bug?extid=00778a9a557a2a5e1a33
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c9eb4c580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=179bbd98580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-0af2f6be.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3fcfb8eefe4d/vmlinux-0af2f6be.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e06a39be2bd8/bzImage-0af2f6be.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+00778a...@syzkaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 4854 Comm: kworker/0:3 Not tainted 6.15.0-rc1-syzkaller #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: events cfg80211_conn_work
RIP: 0010:ether_addr_equal include/linux/etherdevice.h:355 [inline]
RIP: 0010:cfg80211_mlme_deauth+0x35a/0x940 net/wireless/mlme.c:514
Code: 8d 9c 24 b0 00 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 4c 8b 7c 24 28 0f 85 25 03 00 00 44 8b 23 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 2b 03 00 00 45 8b 37 48 8b 44 24 20 48
RSP: 0018:ffffc90002cdf180 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888045820e40 RCX: ffff888000b5c880
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90002cdf268 R08: ffffffff8b8395d8 R09: 0000000000000003
R10: 0000000000000009 R11: ffff888000b5c880 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000003 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88808c596000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f25d8438198 CR3: 000000001f4b4000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
cfg80211_conn_do_work+0x369/0xed0 net/wireless/sme.c:229
cfg80211_conn_work+0x2c2/0x530 net/wireless/sme.c:273
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b7/0x940 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>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ether_addr_equal include/linux/etherdevice.h:355 [inline]
RIP: 0010:cfg80211_mlme_deauth+0x35a/0x940 net/wireless/mlme.c:514
Code: 8d 9c 24 b0 00 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 4c 8b 7c 24 28 0f 85 25 03 00 00 44 8b 23 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 2b 03 00 00 45 8b 37 48 8b 44 24 20 48
RSP: 0018:ffffc90002cdf180 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888045820e40 RCX: ffff888000b5c880
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90002cdf268 R08: ffffffff8b8395d8 R09: 0000000000000003
R10: 0000000000000009 R11: ffff888000b5c880 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000003 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88808c596000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f25d8438198 CR3: 000000001f4b4000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 8d 9c 24 b0 00 00 00 lea 0xb0(%rsp),%ebx
7: 48 89 d8 mov %rbx,%rax
a: 48 c1 e8 03 shr $0x3,%rax
e: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
13: 84 c0 test %al,%al
15: 4c 8b 7c 24 28 mov 0x28(%rsp),%r15
1a: 0f 85 25 03 00 00 jne 0x345
20: 44 8b 23 mov (%rbx),%r12d
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 2b 03 00 00 jne 0x362
37: 45 8b 37 mov (%r15),%r14d
3a: 48 8b 44 24 20 mov 0x20(%rsp),%rax
3f: 48 rex.W


---
This report is generated by a bot. It may contain errors.
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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
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#syz dup: exact-subject-of-another-report

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

[Qasim Ijaz]

On Tue, Apr 08, 2025 at 04:53:34AM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 0af2f6be1b42 Linux 6.15-rc1
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1284523f980000
> kernel config: https://syzkaller.appspot.com/x/.config?x=66996a2350ef05e0
> dashboard link: https://syzkaller.appspot.com/bug?extid=00778a9a557a2a5e1a33
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c9eb4c580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=179bbd98580000
>
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-0af2f6be.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/3fcfb8eefe4d/vmlinux-0af2f6be.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/e06a39be2bd8/bzImage-0af2f6be.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+00778a...@syzkaller.appspotmail.com
>
> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]

I done some analysis and it looks like during cfg80211_conn_work() the
wdev->conn->params.bssid is NULL, this gets passed to cfg80211_conn_do_work()
which hits the CFG80211_CONN_ASSOC_FAILED label of the switch statement where
ether_addr_equal() compares the NULL bssid via ether_addr_equal().

Regards,
Qasim

[Edward Adam Davis]

#syz test

diff --git a/net/wireless/sme.c b/net/wireless/sme.c
index cf998500a965..916c9e8fea15 100644
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -268,6 +268,12 @@ void cfg80211_conn_work(struct work_struct *work)
if (wdev->conn->params.bssid) {
memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
bssid = bssid_buf;
+ } else {
+ if (wdev->conn->state == CFG80211_CONN_ASSOC_FAILED && wdev->conn->bssid) {
+ wdev->conn->params.bssid = wdev->conn->bssid;
+ memcpy(bssid_buf, wdev->conn->bssid, ETH_ALEN);
+ bssid = bssid_buf;
+ }
}
treason = NL80211_TIMEOUT_UNSPECIFIED;
if (cfg80211_conn_do_work(wdev, &treason)) {
@@ -411,6 +417,8 @@ bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status)
return true;
}

+ printk("bssid: %p, pbssid: %p, dis bssid: %p, %s\n",
+ wdev->conn->bssid, wdev->conn->params.bssid, wdev->disconnect_bssid, __func__);
wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
schedule_work(&rdev->conn_work);
return false;

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
general protection fault in cfg80211_mlme_deauth

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]

CPU: 0 UID: 0 PID: 790 Comm: kworker/0:2 Not tainted 6.15.0-rc1-syzkaller-g0af2f6be1b42-dirty #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: events cfg80211_conn_work
RIP: 0010:ether_addr_equal include/linux/etherdevice.h:355 [inline]
RIP: 0010:cfg80211_mlme_deauth+0x35a/0x940 net/wireless/mlme.c:514
Code: 8d 9c 24 b0 00 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 4c 8b 7c 24 28 0f 85 25 03 00 00 44 8b 23 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 2b 03 00 00 45 8b 37 48 8b 44 24 20 48

RSP: 0018:ffffc90001acf160 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8880437a4e40 RCX: ffff888000784880

RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000

RBP: ffffc90001acf248 R08: ffffffff8b8395d8 R09: 0000000000000003
R10: 0000000000000009 R11: ffff888000784880 R12: 0000000000000000

R13: dffffc0000000000 R14: 0000000000000003 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88808c596000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000200000001080 CR3: 0000000011f84000 CR4: 0000000000352ef0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
cfg80211_conn_do_work+0x369/0xed0 net/wireless/sme.c:229

cfg80211_conn_work+0x35e/0x5b0 net/wireless/sme.c:279

process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b7/0x940 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>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ether_addr_equal include/linux/etherdevice.h:355 [inline]
RIP: 0010:cfg80211_mlme_deauth+0x35a/0x940 net/wireless/mlme.c:514
Code: 8d 9c 24 b0 00 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 4c 8b 7c 24 28 0f 85 25 03 00 00 44 8b 23 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 2b 03 00 00 45 8b 37 48 8b 44 24 20 48

RSP: 0018:ffffc90001acf160 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8880437a4e40 RCX: ffff888000784880

RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000

RBP: ffffc90001acf248 R08: ffffffff8b8395d8 R09: 0000000000000003
R10: 0000000000000009 R11: ffff888000784880 R12: 0000000000000000

R13: dffffc0000000000 R14: 0000000000000003 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88808c596000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000200000001080 CR3: 00000000124d8000 CR4: 0000000000352ef0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 8d 9c 24 b0 00 00 00 lea 0xb0(%rsp),%ebx
7: 48 89 d8 mov %rbx,%rax
a: 48 c1 e8 03 shr $0x3,%rax
e: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
13: 84 c0 test %al,%al
15: 4c 8b 7c 24 28 mov 0x28(%rsp),%r15
1a: 0f 85 25 03 00 00 jne 0x345
20: 44 8b 23 mov (%rbx),%r12d
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 2b 03 00 00 jne 0x362
37: 45 8b 37 mov (%r15),%r14d
3a: 48 8b 44 24 20 mov 0x20(%rsp),%rax
3f: 48 rex.W

Tested on:

commit: 0af2f6be Linux 6.15-rc1
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10c8b74c580000

kernel config: https://syzkaller.appspot.com/x/.config?x=66996a2350ef05e0
dashboard link: https://syzkaller.appspot.com/bug?extid=00778a9a557a2a5e1a33
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=15217b4c580000

[Edward Adam Davis]

#syz test

diff --git a/net/wireless/sme.c b/net/wireless/sme.c

index cf998500a965..f78071015d93 100644
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -269,6 +269,12 @@ void cfg80211_conn_work(struct work_struct *work)

memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
bssid = bssid_buf;
}
+

+ if (wdev->conn->state == CFG80211_CONN_ASSOC_FAILED)
+ printk("bssid: %p, pbssid: %p, dis bssid: %p, connected: %d, %s\n",

+ wdev->conn->bssid, wdev->conn->params.bssid,

+ wdev->disconnect_bssid, wdev->connected, __func__);

+
treason = NL80211_TIMEOUT_UNSPECIFIED;
if (cfg80211_conn_do_work(wdev, &treason)) {

struct cfg80211_connect_resp_params cr;

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:

unregister_netdevice: waiting for DEV to become free

unregister_netdevice: waiting for batadv0 to become free. Usage count = 3


Tested on:

commit: a2458824 Merge tag 'linux_kselftest-kunit-6.15-rc2' of..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1269b74c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=eecd7902e39d7933

dashboard link: https://syzkaller.appspot.com/bug?extid=00778a9a557a2a5e1a33
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=1549b74c580000

[Edward Adam Davis]

diff --git a/drivers/net/wireless/virtual/mac80211_hwsim.c b/drivers/net/wireless/virtual/mac80211_hwsim.c
index cf3e976471c6..ee9609d70d72 100644
--- a/drivers/net/wireless/virtual/mac80211_hwsim.c
+++ b/drivers/net/wireless/virtual/mac80211_hwsim.c
@@ -6479,7 +6479,7 @@ static int mac80211_hwsim_netlink_notify(struct notifier_block *nb,
remove_user_radios(notify->portid);

if (notify->portid == hwsim_net_get_wmediumd(notify->net)) {
- printk(KERN_INFO "mac80211_hwsim: wmediumd released netlink"
+ printk_ratelimited(KERN_INFO "mac80211_hwsim: wmediumd released netlink"
" socket, switching to perfect channel medium\n");
hwsim_register_wmediumd(notify->net, 0);
}

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
unregister_netdevice: waiting for DEV to become free

unregister_netdevice: waiting for batadv0 to become free. Usage count = 3


Tested on:

commit: a2458824 Merge tag 'linux_kselftest-kunit-6.15-rc2' of..
git tree: upstream

console output: https://syzkaller.appspot.com/x/log.txt?x=17545070580000

kernel config: https://syzkaller.appspot.com/x/.config?x=eecd7902e39d7933
dashboard link: https://syzkaller.appspot.com/bug?extid=00778a9a557a2a5e1a33
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=14fc7a74580000

[Edward Adam Davis]

#syz test

diff --git a/net/wireless/sme.c b/net/wireless/sme.c

index cf998500a965..b983faa5bbf1 100644
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -269,6 +269,16 @@ void cfg80211_conn_work(struct work_struct *work)

memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
bssid = bssid_buf;
}
+
+ if (wdev->conn->state == CFG80211_CONN_ASSOC_FAILED) {
+ printk("bssid: %p, pbssid: %p, dis bssid: %p, connected: %d, %s\n",
+ wdev->conn->bssid, wdev->conn->params.bssid,
+ wdev->disconnect_bssid, wdev->connected, __func__);

+ BUG_ON(!wdev->conn->bssid ||
+ !wdev->conn->params.bssid ||
+ !wdev->disconnect_bssid);
+ }

+
treason = NL80211_TIMEOUT_UNSPECIFIED;
if (cfg80211_conn_do_work(wdev, &treason)) {
struct cfg80211_connect_resp_params cr;

@@ -411,6 +421,8 @@ bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status)

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
unregister_netdevice: waiting for DEV to become free

unregister_netdevice: waiting for batadv0 to become free. Usage count = 3


Tested on:

commit: a2458824 Merge tag 'linux_kselftest-kunit-6.15-rc2' of..
git tree: upstream

console output: https://syzkaller.appspot.com/x/log.txt?x=108bcc04580000

kernel config: https://syzkaller.appspot.com/x/.config?x=eecd7902e39d7933
dashboard link: https://syzkaller.appspot.com/bug?extid=00778a9a557a2a5e1a33
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=11bd323f980000

[Edward Adam Davis]

#syz test

diff --git a/net/wireless/sme.c b/net/wireless/sme.c

index cf998500a965..39bc68b3428a 100644
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -226,6 +226,9 @@ static int cfg80211_conn_do_work(struct wireless_dev *wdev,
*treason = NL80211_TIMEOUT_ASSOC;
fallthrough;
case CFG80211_CONN_ASSOC_FAILED:
+ BUG_ON(!wdev->conn->bssid);
+ BUG_ON(!wdev->conn->params.bssid);
+ BUG_ON(!wdev->disconnect_bssid);
cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
NULL, 0,
WLAN_REASON_DEAUTH_LEAVING, false);

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
unregister_netdevice: waiting for DEV to become free

unregister_netdevice: waiting for batadv0 to become free. Usage count = 3


Tested on:

commit: a2458824 Merge tag 'linux_kselftest-kunit-6.15-rc2' of..
git tree: upstream

console output: https://syzkaller.appspot.com/x/log.txt?x=14fa5070580000

kernel config: https://syzkaller.appspot.com/x/.config?x=eecd7902e39d7933
dashboard link: https://syzkaller.appspot.com/bug?extid=00778a9a557a2a5e1a33
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=132f323f980000

[Edward Adam Davis]

#syz test: upstream 0af2f6be1b42

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
unregister_netdevice: waiting for DEV to become free

unregister_netdevice: waiting for batadv0 to become free. Usage count = 3


Tested on:

commit: 0af2f6be Linux 6.15-rc1
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=15b317cf980000
kernel config: https://syzkaller.appspot.com/x/.config?x=66996a2350ef05e0

dashboard link: https://syzkaller.appspot.com/bug?extid=00778a9a557a2a5e1a33
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=17d0c070580000

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.