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

[syzbot ci <syzbot+cieb4418b9b188eded@syzkaller.appspotmail.com>]

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/20260811205927.11228-1-ayushmanrout27@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: syzbot@syzkaller.appspotmail.com

---
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