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-0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7bca58.a2bb2777.31c27d.000c.GAE@google.com> Subject: [moderation/CI] Re: wifi: mac80211: guard drv_net_setup_tc() against unbound AP_VLAN sdata From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" 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: 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 ---------------- 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 --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@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: [ayushmanrout27@gmail.com johannes@sipsolutions.net linux-kernel@vger.kernel.org linux-wireless@vger.kernel.org netdev@vger.kernel.org syzbot@syzkaller.appspotmail.com syzkaller-bugs@googlegroups.com] If the report looks fine to you, reply with: #syz upstream If the report is a false positive, reply with #syz invalid