Zero length message leads to an empty skb
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3780 at net/wireless/core.h:231 cfg80211_wext_siwgenie+0x3b1/0x450 net/wireless/wext-sme.c:340
Modules linked in:
CPU: 1 PID: 3780 Comm: syz.0.16 Not tainted 6.1.111-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:wdev_lock net/wireless/core.h:231 [inline]
RIP: 0010:cfg80211_wext_siwgenie+0x3b1/0x450 net/wireless/wext-sme.c:340
Code: fb 6d f7 eb 05 e8 3f fb 6d f7 48 8b 3c 24 e8 26 25 93 00 44 89 f8 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 1f fb 6d f7 <0f> 0b e9 8a fd ff ff e8 13 fb 6d f7 0f 0b eb d0 89 e9 80 e1 07 fe
RSP: 0018:ffffc900046ffa58 EFLAGS: 00010283
RAX: ffffffff8a1cb421 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc9000a0ab000 RSI: 0000000000000806 RDI: 0000000000000807
RBP: 0000000000000000 R08: ffffffff8a1cb18e R09: ffffed10171e8231
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888027054c90
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888027054000
FS:  00007f9716f4c6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd519b6677b CR3: 000000005b24a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ioctl_standard_iw_point+0x780/0xca0 net/wireless/wext-core.c:848
 ioctl_standard_call+0xc3/0x280 net/wireless/wext-core.c:1033
 wext_ioctl_dispatch+0x16f/0x460 net/wireless/wext-core.c:997
 wext_handle_ioctl+0x15b/0x260 net/wireless/wext-core.c:1058
 sock_ioctl+0x13b/0x770 net/socket.c:1255
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f971617dff9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9716f4c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9716336058 RCX: 00007f971617dff9
RDX: 0000000020000000 RSI: 0000000000008b30 RDI: 000000000000000a
RBP: 00007f97161f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9716336058 R15: 00007ffd12aeb268
 </TASK>