WARNING in restore_regulatory_settings

WARNING in restore_regulatory_settings

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    c79f46a2 Linux 5.5-rc5
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1357513ee00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=42c82694f792b2f5
dashboard link: https://syzkaller.appspot.com/bug?extid=d451401ffd00a60677ee
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11538115e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11d6ee3ee00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d451401ffd00a60677ee@syzkaller.appspotmail.com

------------[ cut here ]------------
Unexpected user alpha2: \0\0
WARNING: CPU: 0 PID: 2810 at net/wireless/reg.c:418 is_user_regdom_saved  
net/wireless/reg.c:418 [inline]
WARNING: CPU: 0 PID: 2810 at net/wireless/reg.c:418 restore_alpha2  
net/wireless/reg.c:3092 [inline]
WARNING: CPU: 0 PID: 2810 at net/wireless/reg.c:418  
restore_regulatory_settings+0x226/0x13e0 net/wireless/reg.c:3184
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 2810 Comm: kworker/0:55 Not tainted 5.5.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: events_power_efficient crda_timeout_work
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x197/0x210 lib/dump_stack.c:118
  panic+0x2e3/0x75c kernel/panic.c:221
  __warn.cold+0x2f/0x3e kernel/panic.c:582
  report_bug+0x289/0x300 lib/bug.c:195
  fixup_bug arch/x86/kernel/traps.c:174 [inline]
  fixup_bug arch/x86/kernel/traps.c:169 [inline]
  do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
  do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
  invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:is_user_regdom_saved net/wireless/reg.c:418 [inline]
RIP: 0010:restore_alpha2 net/wireless/reg.c:3092 [inline]
RIP: 0010:restore_regulatory_settings+0x226/0x13e0 net/wireless/reg.c:3184
Code: 03 44 89 f6 e8 2b ba 1f fa 45 84 f6 0f 85 9a 07 00 00 e8 dd b8 1f fa  
41 0f be d5 0f be f3 48 c7 c7 00 ba ed 88 e8 f9 60 f0 f9 <0f> 0b e8 c3 b8  
1f fa 4c 8b 2d 6c e2 12 03 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc900080dfc20 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815e8b46 RDI: fffff5200101bf76
RBP: ffffc900080dfd20 R08: ffff88809f6ca080 R09: ffffed1015d06621
R10: ffffed1015d06620 R11: ffff8880ae833107 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880ae836b40
  crda_timeout_work+0x21/0x30 net/wireless/reg.c:520
  process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
  worker_thread+0x98/0xe40 kernel/workqueue.c:2410
  kthread+0x361/0x430 kernel/kthread.c:255
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..


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