linux-kernel - WARNING in cfg80211_bss

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Message-ID: <000000000000d1018c05b944543e@google.com>
Date:   Tue, 19 Jan 2021 09:40:15 -0800
From:   syzbot <syzbot+95c52e652a2fac1fcdf5@...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: WARNING in cfg80211_bss_update

Hello,

syzbot found the following issue on:

HEAD commit:    66c55602 skbuff: back tiny skbs with kmalloc() in __netdev..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=121bf89f500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c60c9ff9cc916cbc
dashboard link: https://syzkaller.appspot.com/bug?extid=95c52e652a2fac1fcdf5
compiler:       gcc (GCC) 10.1.0-syz 20200507

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+95c52e652a2fac1fcdf5@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 25700 at net/wireless/scan.c:1565 cfg80211_combine_bsses net/wireless/scan.c:1565 [inline]
WARNING: CPU: 1 PID: 25700 at net/wireless/scan.c:1565 cfg80211_bss_update+0x16cd/0x1c60 net/wireless/scan.c:1746
Modules linked in:
CPU: 1 PID: 25700 Comm: kworker/u4:15 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy12 ieee80211_iface_work
RIP: 0010:cfg80211_combine_bsses net/wireless/scan.c:1565 [inline]
RIP: 0010:cfg80211_bss_update+0x16cd/0x1c60 net/wireless/scan.c:1746
Code: 00 48 c7 c7 20 8c 61 8a c6 05 88 7d b9 04 01 e8 a7 15 83 00 e9 27 ff ff ff e8 8f f0 3c f9 0f 0b e9 c2 f4 ff ff e8 83 f0 3c f9 <0f> 0b 4c 89 f7 e8 89 be 8c fb 31 ff 89 c6 88 44 24 70 e8 ec f6 3c
RSP: 0000:ffffc90002e46f50 EFLAGS: 00010212
RAX: 00000000000026ce RBX: 0000000000000001 RCX: ffffc90015d60000
RDX: 0000000000040000 RSI: ffffffff8835d93d RDI: 0000000000000003
RBP: ffff88802f58fc00 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8835d08d R11: 0000000000000000 R12: ffff888022182c68
R13: 0000000000000005 R14: ffff88802f58fc10 R15: ffff888022182c00
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ee27000 CR3: 00000000144e2000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 cfg80211_inform_single_bss_frame_data+0x6e2/0xe90 net/wireless/scan.c:2400
 cfg80211_inform_bss_frame_data+0xa7/0xb10 net/wireless/scan.c:2433
 ieee80211_bss_info_update+0x3ce/0xb20 net/mac80211/scan.c:190
 ieee80211_rx_bss_info net/mac80211/ibss.c:1126 [inline]
 ieee80211_rx_mgmt_probe_beacon+0xccd/0x16b0 net/mac80211/ibss.c:1615
 ieee80211_ibss_rx_queued_mgmt+0xe3e/0x1870 net/mac80211/ibss.c:1642
 ieee80211_iface_work+0x761/0x9e0 net/mac80211/iface.c:1423
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296


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