linux-kernel - Re: WARNING in __cfg80211_connect

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Message-ID: <000000000000660e9a05ad3c4ace@google.com>
Date:   Wed, 19 Aug 2020 08:02:21 -0700
From:   syzbot <syzbot+cc4c0f394e2611edba66@...kaller.appspotmail.com>
To:     davem@...emloft.net, johannes@...solutions.net, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in __cfg80211_connect_result

syzbot has found a reproducer for the following issue on:

HEAD commit:    e3ec1e8c net: eliminate meaningless memcpy to data in pskb..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1664ac89900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3d400a47d1416652
dashboard link: https://syzkaller.appspot.com/bug?extid=cc4c0f394e2611edba66
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15d9de91900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cc4c0f394e2611edba66@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 234 at net/wireless/sme.c:757 __cfg80211_connect_result+0xf71/0x13a0 net/wireless/sme.c:757
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 234 Comm: kworker/u4:5 Not tainted 5.9.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: cfg80211 cfg80211_event_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:231
 __warn.cold+0x20/0x4a 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_connect_result+0xf71/0x13a0 net/wireless/sme.c:757
Code: 89 be ac 02 00 00 48 c7 c7 60 0f 18 89 c6 05 ef ba 2b 03 01 e8 f5 4a d9 f9 e9 4f f6 ff ff e8 d6 cc f2 f9 0f 0b e8 cf cc f2 f9 <0f> 0b e9 0c f2 ff ff e8 c3 cc f2 f9 e8 2e bb 71 00 31 ff 89 c3 89
RSP: 0018:ffffc900019c7bb8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88808ae13000 RCX: ffffffff87816922
RDX: ffff8880a8b0a540 RSI: ffffffff878174b1 RDI: 0000000000000005
RBP: ffff88807be34818 R08: 0000000000000001 R09: ffffffff8c5f1a3f
R10: 0000000000000000 R11: 1ffffffff1835405 R12: 0000000000000000
R13: ffff88807be34828 R14: ffff88808ae13200 R15: ffff88807be34820
 cfg80211_process_wdev_events+0x2c6/0x5b0 net/wireless/util.c:893
 cfg80211_process_rdev_events+0x6e/0x100 net/wireless/util.c:934
 cfg80211_event_work+0x1a/0x20 net/wireless/core.c:320
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Kernel Offset: disabled
Rebooting in 86400 seconds..