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Subjectgeneral protection fault in ieee80211_assign_vif_chanctx
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Hello,

syzbot found the following issue on:

HEAD commit: 3aaf0a27 Merge tag 'clang-format-for-linux-v5.11-rc7' of g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11dde95f500000
kernel config: https://syzkaller.appspot.com/x/.config?x=266a5362c89c8127
dashboard link: https://syzkaller.appspot.com/bug?extid=bbf402b783eeb6d908db
compiler: Debian clang version 11.0.1-2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11fea674d00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1054d88cd00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bbf402b783eeb6d908db@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xfbd59c0000000020: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0xdead000000000100-0xdead000000000107]
CPU: 0 PID: 10022 Comm: syz-executor445 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ieee80211_chanctx_num_assigned net/mac80211/chan.c:22 [inline]
RIP: 0010:ieee80211_assign_vif_chanctx+0x6a7/0xa80 net/mac80211/chan.c:746
Code: 08 00 0f 85 96 00 00 00 e9 f7 00 00 00 e8 a1 ce 8a f8 49 83 c6 20 31 db 4c 89 f5 0f 1f 84 00 00 00 00 00 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 ef e8 fa 34 ce f8 48 8b 6d 00 4c 39 f5
RSP: 0018:ffffc90007fef670 EFLAGS: 00010a02
RAX: 1bd5a00000000020 RBX: 0000000000000002 RCX: ffff8880156c1bc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dead000000000100 R08: ffffffff88ecf9e5 R09: fffffbfff1b672de
R10: fffffbfff1b672de R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888013e2b020 R15: ffff88801bff0bc0
FS: 00007f5557b86700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5557b85288 CR3: 0000000024a0d000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__ieee80211_vif_release_channel+0x279/0x540 net/mac80211/chan.c:1619
ieee80211_vif_release_channel+0x13e/0x1a0 net/mac80211/chan.c:1833
ieee80211_ibss_disconnect+0x6ea/0x870 net/mac80211/ibss.c:735
ieee80211_ibss_leave+0x26/0xf0 net/mac80211/ibss.c:1871
rdev_leave_ibss net/wireless/rdev-ops.h:545 [inline]
__cfg80211_leave_ibss+0x11c/0x200 net/wireless/ibss.c:212
cfg80211_leave_ibss+0x5c/0x70 net/wireless/ibss.c:230
cfg80211_change_iface+0x428/0xaa0 net/wireless/util.c:1047
nl80211_set_interface+0x497/0x7f0 net/wireless/nl80211.c:3839
genl_family_rcv_msg_doit net/netlink/genetlink.c:739 [inline]
genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
genl_rcv_msg+0xe4e/0x1280 net/netlink/genetlink.c:800
netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2494
genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x9ae/0xd50 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg net/socket.c:672 [inline]
____sys_sendmsg+0x519/0x800 net/socket.c:2345
___sys_sendmsg net/socket.c:2399 [inline]
__sys_sendmsg+0x2bf/0x370 net/socket.c:2432
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x446889
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5557b862f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004cb440 RCX: 0000000000446889
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000003
RBP: 00000000004cb44c R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 000000000049b254
R13: 0031313230386c6e R14: 0000000000000000 R15: 00000000004cb448
Modules linked in:
---[ end trace 986da0a98b3932dc ]---
RIP: 0010:ieee80211_chanctx_num_assigned net/mac80211/chan.c:22 [inline]
RIP: 0010:ieee80211_assign_vif_chanctx+0x6a7/0xa80 net/mac80211/chan.c:746
Code: 08 00 0f 85 96 00 00 00 e9 f7 00 00 00 e8 a1 ce 8a f8 49 83 c6 20 31 db 4c 89 f5 0f 1f 84 00 00 00 00 00 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 ef e8 fa 34 ce f8 48 8b 6d 00 4c 39 f5
RSP: 0018:ffffc90007fef670 EFLAGS: 00010a02
RAX: 1bd5a00000000020 RBX: 0000000000000002 RCX: ffff8880156c1bc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dead000000000100 R08: ffffffff88ecf9e5 R09: fffffbfff1b672de
R10: fffffbfff1b672de R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888013e2b020 R15: ffff88801bff0bc0
FS: 00007f5557b86700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5557b43288 CR3: 0000000024a0d000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot will keep track of this issue. See:
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syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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