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

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Date:   Thu, 24 Jun 2021 08:17:18 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+c2f6f09fe907a838effb@...kaller.appspotmail.com>
Cc:     Pavel Skripkin <paskripkin@...il.com>, 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, Jun 23, 2021 at 6:28 PM syzbot
<syzbot+c2f6f09fe907a838effb@...kaller.appspotmail.com> wrote:
>
> > 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
>
> 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.

I think we can say:

#syz dup: WARNING in __vmalloc_node_range
https://syzkaller.appspot.com/bug?id=3c558412597cc402fd7fbb250ca30d04d46c8c60

as that was the original bug report.