Subject: Re: [syzbot] WARNING: zero-size vmalloc in corrupted

From: syzbot <[email-masked]>
Date: Wed, 23 Jun 2021 09:28:44 -0700

> On Wed, 23 Jun 2021 19:19:28 +0300
> Pavel Skripkin <[email-masked]> wrote:
>
>> On Wed, 23 Jun 2021 02:15:23 -0700
>> syzbot <[email-masked]> wrote:
>> 
>> > Hello,
>> > 
>> > syzbot found the following issue on:
>> > 
>> > HEAD commit:    13311e74 Linux 5.13-rc7
>> > git tree:       upstream
>> > console output:
>> > https://syzkaller.appspot.com/x/log.txt?x=15d01e58300000 kernel
>> > config:  https://syzkaller.appspot.com/x/.config?x=42ecca11b759d96c
>> > dashboard link:
>> > https://syzkaller.appspot.com/bug?extid=c2f6f09fe907a838effb syz
>> > repro:
>> > https://syzkaller.appspot.com/x/repro.syz?x=14bb89e8300000 C
>> > reproducer:
>> > https://syzkaller.appspot.com/x/repro.c?x=17cc51b8300000
>> > 
>> > The issue was bisected to:
>> > 
>> > commit f9006acc8dfe59e25aa75729728ac57a8d84fc32
>> > Author: Florian Westphal <[email-masked]>
>> > Date:   Wed Apr 21 07:51:08 2021 +0000
>> > 
>> >     netfilter: arp_tables: pass table pointer via nf_hook_ops
>> > 
>> > bisection log:
>> > https://syzkaller.appspot.com/x/bisect.txt?x=13b88400300000 final
>> > oops:
>> > https://syzkaller.appspot.com/x/report.txt?x=10788400300000 console
>> > output: https://syzkaller.appspot.com/x/log.txt?x=17b88400300000
>> > 
>> 
>> This one is similar to previous zero-size vmalloc, I guess :)
>> 
>> #syz test
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>> master
>> 
>> 
>
> Hah, I didn't notice that this one is already fixed by me. But the
> patch is in the media tree, it's not upstreamed yet:  
>
> https://git.linuxtv.org/media_tree.git/commit/?id=c680ed46e418e9c785d76cf44eb33bfd1e8cf3f6
>
> So, 
>
> #syz dup: WARNING: zero-size vmalloc in dvb_dmx_init

Can't dup bug to a bug in different reporting (upstream->internal).Please dup syzbot bugs only onto syzbot bugs for the same kernel/reporting.

> With regards,
> Pavel Skripkin