[syzbot] [wireless?] divide error in mac80211_hwsim_write_tsf

[syzbot] [wireless?] divide error in mac80211_hwsim_write_tsf

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    83f1454877cc Merge tag 'ext4_for_linus-7.2-rc1' of git://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17956aae580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8deb4438448ed47a
dashboard link: https://syzkaller.appspot.com/bug?extid=21629c14aa749636db9d
compiler:       Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-83f14548.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/06b66919e887/vmlinux-83f14548.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3dedd791b7cd/bzImage-83f14548.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+21629c14aa749636db9d@syzkaller.appspotmail.com

Oops: divide error: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:mac80211_hwsim_write_tsf+0x3a3/0x590 drivers/net/wireless/virtual/mac80211_hwsim_main.c:1628
Code: 81 c4 e8 49 00 00 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 1b bb 22 fb 48 8b 34 24 41 03 34 24 66 b8 20 03 31 d2 <66> f7 f5 0f b7 d8 4d 8d 65 0a 49 83 c5 0d 4c 89 e0 48 c1 e8 03 42
RSP: 0018:ffffc900037aedf0 EFLAGS: 00010246
RAX: 1ffff110080a0320 RBX: 000000000000001c RCX: 0000000000100000
RDX: 0000000000000000 RSI: 0000000005e6b00c RDI: 0000000000000230
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520006f5dac R12: ffff888040547c08
R13: ffff88803d7fadda R14: dffffc0000000000 R15: 0000000000000020
FS:  00007f2f6aff66c0(0000) GS:ffff88808c852000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002280 CR3: 0000000013282000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 mac80211_hwsim_tx_frame_no_nl+0x16b/0x1760 drivers/net/wireless/virtual/mac80211_hwsim_main.c:1902
 mac80211_hwsim_tx+0x1784/0x2500 drivers/net/wireless/virtual/mac80211_hwsim_main.c:2261
 drv_tx net/mac80211/driver-ops.h:38 [inline]
 ieee80211_tx_frags+0x3df/0x890 net/mac80211/tx.c:1746
 __ieee80211_tx+0x267/0x580 net/mac80211/tx.c:1801
 ieee80211_tx+0x312/0x4b0 net/mac80211/tx.c:1984
 ieee80211_monitor_start_xmit+0xb33/0x1280 net/mac80211/tx.c:2479
 __netdev_start_xmit include/linux/netdevice.h:5387 [inline]
 netdev_start_xmit include/linux/netdevice.h:5396 [inline]
 xmit_one net/core/dev.c:3889 [inline]
 dev_hard_start_xmit+0x2cd/0x830 net/core/dev.c:3905
 __dev_queue_xmit+0x1435/0x37f0 net/core/dev.c:4872
 packet_snd net/packet/af_packet.c:3082 [inline]
 packet_sendmsg+0x3d95/0x5040 net/packet/af_packet.c:3114
 sock_sendmsg_nosec net/socket.c:775 [inline]
 __sock_sendmsg net/socket.c:790 [inline]
 __sys_sendto+0x626/0x6c0 net/socket.c:2252
 __do_sys_sendto net/socket.c:2259 [inline]
 __se_sys_sendto net/socket.c:2255 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2255
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2f6a19ce59
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:00007f2f6aff5fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f2f6a415fa0 RCX: 00007f2f6a19ce59
RDX: 0000000000000026 RSI: 0000200000000640 RDI: 0000000000000007
RBP: 00007f2f6a232e6f R08: 0000200000000380 R09: 0000000000000014
R10: 0000000004000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2f6a416038 R14: 00007f2f6a415fa0 R15: 00007ffff9cddab8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:mac80211_hwsim_write_tsf+0x3a3/0x590 drivers/net/wireless/virtual/mac80211_hwsim_main.c:1628
Code: 81 c4 e8 49 00 00 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 1b bb 22 fb 48 8b 34 24 41 03 34 24 66 b8 20 03 31 d2 <66> f7 f5 0f b7 d8 4d 8d 65 0a 49 83 c5 0d 4c 89 e0 48 c1 e8 03 42
RSP: 0018:ffffc900037aedf0 EFLAGS: 00010246
RAX: 1ffff110080a0320 RBX: 000000000000001c RCX: 0000000000100000
RDX: 0000000000000000 RSI: 0000000005e6b00c RDI: 0000000000000230
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520006f5dac R12: ffff888040547c08
R13: ffff88803d7fadda R14: dffffc0000000000 R15: 0000000000000020
FS:  00007f2f6aff66c0(0000) GS:ffff88808c852000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002280 CR3: 0000000013282000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	81 c4 e8 49 00 00    	add    $0x49e8,%esp
   6:	4c 89 e0             	mov    %r12,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1)
  12:	74 08                	je     0x1c
  14:	4c 89 e7             	mov    %r12,%rdi
  17:	e8 1b bb 22 fb       	call   0xfb22bb37
  1c:	48 8b 34 24          	mov    (%rsp),%rsi
  20:	41 03 34 24          	add    (%r12),%esi
  24:	66 b8 20 03          	mov    $0x320,%ax
  28:	31 d2                	xor    %edx,%edx
* 2a:	66 f7 f5             	div    %bp <-- trapping instruction
  2d:	0f b7 d8             	movzwl %ax,%ebx
  30:	4d 8d 65 0a          	lea    0xa(%r13),%r12
  34:	49 83 c5 0d          	add    $0xd,%r13
  38:	4c 89 e0             	mov    %r12,%rax
  3b:	48 c1 e8 03          	shr    $0x3,%rax
  3f:	42                   	rex.X


---
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