[moderation/CI] Re: wifi: mac80211: guard drv_net_setup_tc() against unbound AP_VLAN sdata

[syzbot ci]

syzbot ci has tested the following series

[v1] wifi: mac80211: guard drv_net_setup_tc() against unbound AP_VLAN sdata
https://lore.kernel.org/all/20260811205927.112...@gmail.com
* [PATCH] wifi: mac80211: guard drv_net_setup_tc() against unbound AP_VLAN sdata

and found the following issue:
WARNING in ieee80211_netdev_setup_tc

Full report is available here:
https://ci.syzbot.org/series/3ec3e079-9059-4c39-a313-0258dcc9d685

***

WARNING in ieee80211_netdev_setup_tc

tree: net-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git
base: 31397cf1819210bd63fa3d2c7d8c24f7c8667d99
arch: amd64
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
config: https://ci.syzbot.org/builds/1331e819-db99-424b-bb55-8ffa3576dfd4/config
syz repro: https://ci.syzbot.org/findings/f970b19c-569e-48d1-9391-879b071ef920/syz_repro

------------[ cut here ]------------
wlan1: Failed check-sdata-in-driver check, flags: 0x0
WARNING: net/mac80211/driver-ops.h:1719 at drv_net_setup_tc net/mac80211/driver-ops.h:1719 [inline], CPU#1: kworker/u8:0/12
WARNING: net/mac80211/driver-ops.h:1719 at ieee80211_netdev_setup_tc+0x2f0/0x550 net/mac80211/iface.c:938, CPU#1: kworker/u8:0/12
Modules linked in:
CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:drv_net_setup_tc net/mac80211/driver-ops.h:1719 [inline]
RIP: 0010:ieee80211_netdev_setup_tc+0x345/0x550 net/mac80211/iface.c:938
Code: 48 8b 02 48 8d b0 20 01 00 00 48 85 c0 48 0f 44 f1 0f b6 04 2b 84 c0 4d 89 ee 0f 85 ad 00 00 00 49 8d 84 24 68 0a 00 00 8b 10 <67> 48 0f b9 3a e9 16 fe ff ff e8 fc 92 84 f6 90 0f 0b 90 e9 75 fe
RSP: 0000:ffffc90000117158 EFLAGS: 00010246
RAX: ffff88816c7b5928 RBX: 1ffff1102d8f6b25 RCX: ffff88816c7b5938
RDX: 0000000000000000 RSI: ffff88816c7b4120 RDI: ffffffff906931c0
RBP: dffffc0000000000 R08: ffffc90000117237 R09: 0000000000000000
R10: ffffc90000117208 R11: ffffffff8b426c40 R12: ffff88816c7b4ec0
R13: ffffc90000117200 R14: ffffc90000117200 R15: ffff88816c7b4000
FS: 0000000000000000(0000) GS:ffff8882a8f58000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa250470000 CR3: 000000017949c000 CR4: 00000000000006f0
Call Trace:
<TASK>
tcf_block_offload_cmd+0x235/0x3b0 net/sched/cls_api.c:853
tcf_block_offload_unbind net/sched/cls_api.c:917 [inline]
__tcf_block_put+0x281/0x490 net/sched/cls_api.c:1344
tcf_block_put+0x6c/0xa0 net/sched/cls_api.c:1587
cake_destroy+0x4b/0x80 net/sched/sch_cake.c:2811
__qdisc_destroy+0x153/0x470 net/sched/sch_generic.c:1122
qdisc_put net/sched/sch_generic.c:1150 [inline]
dev_shutdown+0x352/0x450 net/sched/sch_generic.c:1515
unregister_netdevice_many_notify+0x11f4/0x2140 net/core/dev.c:12478
unregister_netdevice_many net/core/dev.c:12562 [inline]
unregister_netdevice_queue+0x2f5/0x340 net/core/dev.c:12363
unregister_netdevice include/linux/netdevice.h:3481 [inline]
_cfg80211_unregister_wdev+0x156/0x5a0 net/wireless/core.c:1425
ieee80211_remove_interfaces+0x49c/0x6a0 net/mac80211/iface.c:2492
ieee80211_unregister_hw+0x5d/0x2c0 net/mac80211/main.c:1717
mac80211_hwsim_del_radio+0x28a/0x4a0 drivers/net/wireless/virtual/mac80211_hwsim_main.c:6251
hwsim_exit_net+0xe8e/0xf50 drivers/net/wireless/virtual/mac80211_hwsim_main.c:7260
ops_exit_list net/core/net_namespace.c:200 [inline]
ops_undo_list+0x43d/0x8d0 net/core/net_namespace.c:253
cleanup_net+0x572/0x810 net/core/net_namespace.c:706
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
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>
----------------
Code disassembly (best guess):
0: 48 8b 02 mov (%rdx),%rax
3: 48 8d b0 20 01 00 00 lea 0x120(%rax),%rsi
a: 48 85 c0 test %rax,%rax
d: 48 0f 44 f1 cmove %rcx,%rsi
11: 0f b6 04 2b movzbl (%rbx,%rbp,1),%eax
15: 84 c0 test %al,%al
17: 4d 89 ee mov %r13,%r14
1a: 0f 85 ad 00 00 00 jne 0xcd
20: 49 8d 84 24 68 0a 00 lea 0xa68(%r12),%rax
27: 00
28: 8b 10 mov (%rax),%edx
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: e9 16 fe ff ff jmp 0xfffffe4a
34: e8 fc 92 84 f6 call 0xf6849335
39: 90 nop
3a: 0f 0b ud2
3c: 90 nop
3d: e9 .byte 0xe9
3e: 75 fe jne 0x3e


***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syz...@syzkaller.appspotmail.com

---
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If the report looks fine to you, reply with:
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If the report is a false positive, reply with
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[syzbot ci]

syzbot ci has tested the following series

[v1] wifi: mac80211: guard drv_net_setup_tc() against unbound AP_VLAN sdata

https://lore.kernel.org/all/20260811210926.114...@gmail.com

* [PATCH] wifi: mac80211: guard drv_net_setup_tc() against unbound AP_VLAN sdata

and found the following issue:
WARNING in ieee80211_netdev_setup_tc

Full report is available here:

https://ci.syzbot.org/series/db0f7870-cfa6-4a9b-b78b-225ce86c2a89

***

WARNING in ieee80211_netdev_setup_tc

tree: wireless-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/wireless/wireless-next.git
base: ca800a9302764c445de0da0e84d2252400a770ee

arch: amd64
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

config: https://ci.syzbot.org/builds/e40f4f29-7949-48eb-9c12-006be4046454/config
syz repro: https://ci.syzbot.org/findings/4c184dbd-070a-4d74-8afd-085fa1b5f0a2/syz_repro

------------[ cut here ]------------
syzkaller0: Failed check-sdata-in-driver check, flags: 0x0
WARNING: net/mac80211/driver-ops.h:1719 at drv_net_setup_tc net/mac80211/driver-ops.h:1719 [inline], CPU#1: syz.1.18/5848
WARNING: net/mac80211/driver-ops.h:1719 at ieee80211_netdev_setup_tc+0x2f0/0x550 net/mac80211/iface.c:938, CPU#1: syz.1.18/5848
Modules linked in:
CPU: 1 UID: 0 PID: 5848 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full)

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014

RIP: 0010:drv_net_setup_tc net/mac80211/driver-ops.h:1719 [inline]
RIP: 0010:ieee80211_netdev_setup_tc+0x345/0x550 net/mac80211/iface.c:938

Code: 48 8b 02 48 8d b0 20 01 00 00 48 85 c0 48 0f 44 f1 0f b6 04 2b 84 c0 4d 89 ee 0f 85 ad 00 00 00 49 8d 84 24 68 0a 00 00 8b 10 <67> 48 0f b9 3a e9 16 fe ff ff e8 cc ee 86 f6 90 0f 0b 90 e9 75 fe
RSP: 0018:ffffc900042ff078 EFLAGS: 00010246
RAX: ffff8881709e9928 RBX: 1ffff1102e13d325 RCX: ffff8881709e9938
RDX: 0000000000000000 RSI: ffff8881709e8120 RDI: ffffffff9068ed60
RBP: dffffc0000000000 R08: ffffc900042ff157 R09: 0000000000000000
R10: ffffc900042ff128 R11: ffffffff8b3fff60 R12: ffff8881709e8ec0
R13: ffffc900042ff120 R14: ffffc900042ff120 R15: ffff8881709e8000
FS: 00007f5cd6df16c0(0000) GS:ffff8882a8f66000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00002000000012c0 CR3: 000000016f0fc000 CR4: 00000000000006f0
Call Trace:
<TASK>
tcf_block_offload_cmd+0x235/0x3b0 net/sched/cls_api.c:838
tcf_block_offload_bind net/sched/cls_api.c:875 [inline]
tcf_block_get_ext+0xfe0/0x17d0 net/sched/cls_api.c:1498
tcf_block_get+0x67/0xa0 net/sched/cls_api.c:1543
multiq_init+0x72/0x2b0 net/sched/sch_multiq.c:246
qdisc_create+0x7b5/0xf00 net/sched/sch_api.c:1337
__tc_modify_qdisc net/sched/sch_api.c:1771 [inline]
tc_modify_qdisc+0x17af/0x2390 net/sched/sch_api.c:1835
rtnetlink_rcv_msg+0x7b9/0xc00 net/core/rtnetlink.c:7121
netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775
__sock_sendmsg net/socket.c:790 [inline]
____sys_sendmsg+0x54e/0x850 net/socket.c:2684
___sys_sendmsg+0x2a5/0x360 net/socket.c:2738
__sys_sendmsg net/socket.c:2770 [inline]
__do_sys_sendmsg net/socket.c:2775 [inline]
__se_sys_sendmsg net/socket.c:2773 [inline]
__x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2773
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5cd5f9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5cd6df1028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f5cd6225fa0 RCX: 00007f5cd5f9e0d9
RDX: 0000000000000000 RSI: 00002000000012c0 RDI: 0000000000000004
RBP: 00007f5cd6035024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5cd6226038 R14: 00007f5cd6225fa0 R15: 00007ffc6aba2558

</TASK>
----------------
Code disassembly (best guess):
0: 48 8b 02 mov (%rdx),%rax
3: 48 8d b0 20 01 00 00 lea 0x120(%rax),%rsi
a: 48 85 c0 test %rax,%rax
d: 48 0f 44 f1 cmove %rcx,%rsi
11: 0f b6 04 2b movzbl (%rbx,%rbp,1),%eax
15: 84 c0 test %al,%al
17: 4d 89 ee mov %r13,%r14
1a: 0f 85 ad 00 00 00 jne 0xcd
20: 49 8d 84 24 68 0a 00 lea 0xa68(%r12),%rax
27: 00
28: 8b 10 mov (%rax),%edx
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: e9 16 fe ff ff jmp 0xfffffe4a

34: e8 cc ee 86 f6 call 0xf686ef05

39: 90 nop
3a: 0f 0b ud2
3c: 90 nop
3d: e9 .byte 0xe9
3e: 75 fe jne 0x3e


***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syz...@syzkaller.appspotmail.com

---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzk...@googlegroups.com.

To test a patch for this bug, please reply with `#syz test`
(should be on a separate line).

The patch should be attached to the email.
Note: arguments like custom git repos and branches are not supported.

The email will later be sent to:

[ayushma...@gmail.com joha...@sipsolutions.net linux-...@vger.kernel.org linux-w...@vger.kernel.org n...@nbd.name syz...@syzkaller.appspotmail.com]

[Aleksandr Nogikh]

#syz upstream

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[syzbot ci]

> #syz upstream

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