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SubjectKASAN: slab-out-of-bounds Read in corrupted (2)
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Hello,

syzbot found the following crash on:

HEAD commit: 156c0591 Merge tag 'linux-kselftest-5.2-rc4' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13512d51a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=60564cb52ab29d5b
dashboard link: https://syzkaller.appspot.com/bug?extid=9a901acbc447313bfe3e
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11a4b01ea00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9a901acbc447313bfe3e@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-out-of-bounds in vsnprintf+0x1727/0x19a0
lib/vsprintf.c:2503
Read of size 8 at addr ffff8880a91c7d00 by task syz-executor.0/9821

CPU: 0 PID: 9821 Comm: syz-executor.0 Not tainted 5.2.0-rc3+ #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:

Allocated by task 1024:
(stack is not available)

Freed by task 2310999008:
------------[ cut here ]------------
Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected
to SLAB object 'skbuff_head_cache' (offset 24, size 1)!
WARNING: CPU: 0 PID: 9821 at mm/usercopy.c:78 usercopy_warn+0xeb/0x110
mm/usercopy.c:78
Kernel panic - not syncing: panic_on_warn set ...
Shutting down cpus with NMI
Kernel Offset: disabled


---
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@googlegroups.com.

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

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