------------[ cut here ]------------
!cfg80211_chandef_valid(chandef)
WARNING: net/wireless/chan.c:904 at cfg80211_chandef_dfs_required+0xe0c/0xed0, CPU#1: syz.2.4867/17120
Modules linked in:
CPU: 1 UID: 0 PID: 17120 Comm: syz.2.4867 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:cfg80211_chandef_dfs_required+0xe0c/0xed0
Code: de e8 18 ed c0 f6 48 83 fb 3f 0f 87 aa 00 00 00 e8 c9 e8 c0 f6 b8 01 00 00 00 89 d9 48 d3 e0 e9 3b f4 ff ff e8 b5 e8 c0 f6 90 <0f> 0b 90 b8 ea ff ff ff e9 28 f4 ff ff e8 32 78 a5 00 89 d1 80 e1
RSP: 0018:ffffc9000724f6e0 EFLAGS: 00010283
RAX: ffffffff8b04dbab RBX: ffff88819f52d8e8 RCX: 0000000000080000
RDX: ffffc9000b8c9000 RSI: 000000000000062b RDI: 000000000000062c
RBP: ffffc9000724f870 R08: ffffffff8225a3ef R09: ffff88823c63f5e8
R10: dffffc0000000000 R11: ffffed1037732558 R12: 0000000000000006
R13: dffffc0000000000 R14: ffffc9000724f9e0 R15: ffff88819f52c018
FS:  00007f37ffc4c6c0(0000) GS:ffff8882a927a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000040 CR3: 000000017628e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _ieee80211_link_use_channel+0x28c/0x860
 ieee80211_set_monitor_channel+0x6fd/0xa10
 cfg80211_set_monitor_channel+0x22d/0x5f0
 cfg80211_wext_siwfreq+0x717/0x850
 ioctl_standard_call+0xcb/0x1b0
 wext_ioctl_dispatch+0xee/0x410
 wext_handle_ioctl+0x10f/0x1d0
 sock_ioctl+0x159/0x7f0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f37fed9ce59
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:00007f37ffc4c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f37ff015fa0 RCX: 00007f37fed9ce59
RDX: 0000200000000040 RSI: 0000000000008b04 RDI: 0000000000000003
RBP: 00007f37fee32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f37ff016038 R14: 00007f37ff015fa0 R15: 00007ffc4cf0bf48
 </TASK>
