------------[ cut here ]------------
!cfg80211_chandef_valid(chandef)
WARNING: net/wireless/chan.c:796 at cfg80211_chandef_dfs_required+0xe06/0xec0 net/wireless/chan.c:796, CPU#1: syz.4.1661/12779
Modules linked in:
CPU: 1 UID: 0 PID: 12779 Comm: syz.4.1661 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:cfg80211_chandef_dfs_required+0xe06/0xec0 net/wireless/chan.c:796
Code: de e8 ce 6d b3 f6 48 83 fb 3f 0f 87 aa 00 00 00 e8 7f 69 b3 f6 b8 01 00 00 00 89 d9 48 d3 e0 e9 41 f4 ff ff e8 6b 69 b3 f6 90 <0f> 0b 90 b8 ea ff ff ff e9 2e f4 ff ff e8 58 7c a6 00 89 d1 80 e1
RSP: 0018:ffffc90003117700 EFLAGS: 00010283
RAX: ffffffff8b126785 RBX: ffff88804863d7f8 RCX: 0000000000080000
RDX: ffffc9000e292000 RSI: 00000000000005cc RDI: 00000000000005cd
RBP: ffffc90003117890 R08: ffffffff8225adbf R09: ffff8880b873f5e8
R10: dffffc0000000000 R11: ffffed100aed254a R12: 0000000000000006
R13: dffffc0000000000 R14: ffffc90003117a00 R15: dffffc0000000000
FS:  00007f61522cd6c0(0000) GS:ffff888125313000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c328f7f CR3: 000000007d1da000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 _ieee80211_link_use_channel+0x27a/0x7f0 net/mac80211/chan.c:2175
 ieee80211_link_use_channel net/mac80211/ieee80211_i.h:2786 [inline]
 ieee80211_set_monitor_channel+0x692/0x8e0 net/mac80211/cfg.c:1087
 rdev_set_monitor_channel net/wireless/rdev-ops.h:453 [inline]
 cfg80211_set_monitor_channel+0x22d/0x5f0 net/wireless/chan.c:1602
 cfg80211_wext_siwfreq+0x713/0x850 net/wireless/wext-compat.c:792
 ioctl_standard_call+0xcb/0x1b0 net/wireless/wext-core.c:1042
 wireless_process_ioctl net/wireless/wext-core.c:-1 [inline]
 wext_ioctl_dispatch+0xee/0x410 net/wireless/wext-core.c:1013
 wext_handle_ioctl+0x10f/0x1d0 net/wireless/wext-core.c:1074
 sock_ioctl+0x159/0x7f0 net/socket.c:1366
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f615139cdd9
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:00007f61522cd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6151615fa0 RCX: 00007f615139cdd9
RDX: 0000200000000040 RSI: 0000000000008b04 RDI: 0000000000000006
RBP: 00007f6151432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6151616038 R14: 00007f6151615fa0 R15: 00007fff9bb668e8
 </TASK>