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

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Date:   Wed, 23 Jun 2021 19:28:37 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     syzbot <syzbot+c2f6f09fe907a838effb@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, coreteam@...filter.org,
        davem@...emloft.net, dsahern@...nel.org, fw@...len.de,
        kadlec@...filter.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        pablo@...filter.org, syzkaller-bugs@...glegroups.com,
        yoshfuji@...ux-ipv6.org
Subject: Re: [syzbot] WARNING: zero-size vmalloc in corrupted

On Wed, 23 Jun 2021 19:19:28 +0300
Pavel Skripkin <paskripkin@...il.com> wrote:

> On Wed, 23 Jun 2021 02:15:23 -0700
> syzbot <syzbot+c2f6f09fe907a838effb@...kaller.appspotmail.com> 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 <fw@...len.de>
> > 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

With regards,
Pavel Skripkin