netdev - KASAN: slab-out-of-bounds Write in check

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Message-ID: <00000000000042744d058e024589@google.com>
Date:   Thu, 18 Jul 2019 22:48:06 -0700
From:   syzbot <syzbot+e2416b38b581ad58bc1e@...kaller.appspotmail.com>
To:     ast@...nel.org, daniel@...earbox.net, john.fastabend@...il.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: KASAN: slab-out-of-bounds Write in check_noncircular

Hello,

syzbot found the following crash on:

HEAD commit:    22051d9c Merge tag 'platform-drivers-x86-v5.3-2' of git://..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14090a34600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=135cb826ac59d7fc
dashboard link: https://syzkaller.appspot.com/bug?extid=e2416b38b581ad58bc1e
compiler:       clang version 9.0.0 (/home/glider/llvm/clang  
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1397afe0600000

The bug was bisected to:

commit e9db4ef6bf4ca9894bb324c76e01b8f1a16b2650
Author: John Fastabend <john.fastabend@...il.com>
Date:   Sat Jun 30 13:17:47 2018 +0000

     bpf: sockhash fix omitted bucket lock in sock_close

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=131928f4600000
final crash:    https://syzkaller.appspot.com/x/report.txt?x=109928f4600000
console output: https://syzkaller.appspot.com/x/log.txt?x=171928f4600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e2416b38b581ad58bc1e@...kaller.appspotmail.com
Fixes: e9db4ef6bf4c ("bpf: sockhash fix omitted bucket lock in sock_close")

==================================================================
BUG: KASAN: slab-out-of-bounds in check_noncircular+0x91/0x560  
/kernel/locking/lockdep.c:1722
Write of size 56 at addr ffff88809752a1a0 by task syz-executor.2/9504

CPU: 1 PID: 9504 Comm: syz-executor.2 Not tainted 5.2.0+ #34
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:

Allocated by task 2258096832:
------------[ cut here ]------------
kernel BUG at mm/slab.c:4179!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9504 Comm: syz-executor.2 Not tainted 5.2.0+ #34
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:__check_heap_object+0xcb/0xd0 /mm/slab.c:4203
Code: 4c 89 d1 4d 89 c8 e8 34 a6 07 00 5b 41 5e 5d c3 49 8b 73 58 41 0f b6  
d0 48 c7 c7 0f eb 7e 88 4c 89 d1 4d 89 c8 e8 d5 a6 07 00 <0f> 0b 0f 1f 00  
55 48 89 e5 53 48 83 ff 10 0f 84 90 00 00 00 48 85
RSP: 0018:ffff8880975297a0 EFLAGS: 00010046
RAX: 0000000000000fc5 RBX: 00000000000011e0 RCX: 000000000000000c
RDX: 000000000000000c RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffff8880975297b0 R08: 0000000000000000 R09: fffff940004ba941
R10: ffff8880975298a0 R11: ffff8880aa5918c0 R12: ffff8880975298a2
R13: 01fffc0000010200 R14: ffff8880975286c0 R15: ffff8880975298a0
FS:  0000555556816940(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8aff8f88 CR3: 000000008586d000 CR4: 00000000001406e0
Call Trace:
Modules linked in:
---[ end trace 35842f070e95906d ]---
RIP: 0010:__check_heap_object+0xcb/0xd0 /mm/slab.c:4203
Code: 4c 89 d1 4d 89 c8 e8 34 a6 07 00 5b 41 5e 5d c3 49 8b 73 58 41 0f b6  
d0 48 c7 c7 0f eb 7e 88 4c 89 d1 4d 89 c8 e8 d5 a6 07 00 <0f> 0b 0f 1f 00  
55 48 89 e5 53 48 83 ff 10 0f 84 90 00 00 00 48 85
RSP: 0018:ffff8880975297a0 EFLAGS: 00010046
RAX: 0000000000000fc5 RBX: 00000000000011e0 RCX: 000000000000000c
RDX: 000000000000000c RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffff8880975297b0 R08: 0000000000000000 R09: fffff940004ba941
R10: ffff8880975298a0 R11: ffff8880aa5918c0 R12: ffff8880975298a2
R13: 01fffc0000010200 R14: ffff8880975286c0 R15: ffff8880975298a0
FS:  0000555556816940(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff8aff8f88 CR3: 000000008586d000 CR4: 00000000001406e0


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches