Subject: Re: WARNING in cfg80211_connect

From: syzbot <[email-masked]>
Date: Thu, 01 Oct 2020 14:32:15 -0700

syzbot has found a reproducer for the following issue on:

HEAD commit:    87d5034d Merge tag 'mlx5-updates-2020-09-30' of git://git...
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=121d2313900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7b5cc8ec2218e99d
dashboard link: https://syzkaller.appspot.com/bug?extid=5f9392825de654244975
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1100d333900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1414c997900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]

------------[ cut here ]------------
WARNING: CPU: 0 PID: 6914 at net/wireless/sme.c:533 cfg80211_sme_connect net/wireless/sme.c:533 [inline]
WARNING: CPU: 0 PID: 6914 at net/wireless/sme.c:533 cfg80211_connect+0x1432/0x2010 net/wireless/sme.c:1258
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 6914 Comm: syz-executor935 Not tainted 5.9.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 panic+0x382/0x7fb kernel/panic.c:231
 __warn.cold+0x20/0x4b kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:cfg80211_sme_connect net/wireless/sme.c:533 [inline]
RIP: 0010:cfg80211_connect+0x1432/0x2010 net/wireless/sme.c:1258
Code: 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 a2 0a 00 00 49 83 bd 48 01 00 00 00 0f 84 b6 f7 ff ff e8 7e 1e b5 f9 <0f> 0b e8 77 1e b5 f9 48 8b 54 24 18 48 b8 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90005667360 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888093bdc380 RSI: ffffffff87c166d2 RDI: ffffffff896172c0
RBP: ffff888088cf8d30 R08: 0000000000000001 R09: ffff888088cf8d35
R10: ffffed101119f1a6 R11: 0000000000000000 R12: ffffc90005667500
R13: ffff888088cf8c10 R14: ffff888088cf8d58 R15: ffffffff89617180
 nl80211_connect+0x1646/0x2220 net/wireless/nl80211.c:10615
 genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:714 [inline]
 genl_rcv_msg+0x61d/0x980 net/netlink/genetlink.c:731
 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2470
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:742
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:671
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x442139
Code: e8 ac 00 03 00 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 7b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff18327468 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442139
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000002000000000 R09: 0000002000000000
R10: 0000002000000000 R11: 0000000000000246 R12: 000000000000f7cb
R13: 0000000000000000 R14: 000000000000000c R15: 0000000000000004
Kernel Offset: disabled
Rebooting in 86400 seconds..