linux-kernel - Re: [syzbot] BUG: unable to handle kernel NULL pointer dereference in unix

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Date:   Mon, 24 Jan 2022 14:00:01 +0100
From:   Vegard Nossum <vegard.nossum@...il.com>
To:     syzbot <syzbot+cd7ceee0d3b5892f07af@...kaller.appspotmail.com>
Cc:     Rao.Shoaib@...cle.com, andrii@...nel.org, ast@...nel.org,
        bpf@...r.kernel.org, cong.wang@...edance.com, daniel@...earbox.net,
        "David S. Miller" <davem@...emloft.net>, john.fastabend@...il.com,
        kafai@...com, kpsingh@...nel.org, kuba@...nel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Netdev List <netdev@...r.kernel.org>,
        songliubraving@...com, syzkaller-bugs@...glegroups.com,
        Al Viro <viro@...iv.linux.org.uk>, yhs@...com
Subject: Re: [syzbot] BUG: unable to handle kernel NULL pointer dereference in unix_shutdown

On Sat, 21 Aug 2021 at 17:19, syzbot
<syzbot+cd7ceee0d3b5892f07af@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    9803fb968c8c Add linux-next specific files for 20210817
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1727c65e300000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=681282daead30d81
> dashboard link: https://syzkaller.appspot.com/bug?extid=cd7ceee0d3b5892f07af
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13fb6ff9300000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15272861300000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+cd7ceee0d3b5892f07af@...kaller.appspotmail.com
>
> BUG: kernel NULL pointer dereference, address: 0000000000000000

Looks like this was only ever hit in linux-next and fixed before it
got to mainline? Anyway, I can confirm the following patch fixes the
issue:

#syz fix: af_unix: Fix NULL pointer bug in unix_shutdown


Vegard