netdev - Re: [syzbot] kernel BUG in pskb_expand

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Date:   Wed, 5 Jan 2022 15:04:43 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     syzbot <syzbot+4c63f36709a642f801c5@...kaller.appspotmail.com>,
        anthony.l.nguyen@...el.com, changbin.du@...el.com,
        Christian Brauner <christian.brauner@...ntu.com>,
        David Miller <davem@...emloft.net>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        intel-wired-lan-owner@...osl.org, intel-wired-lan@...ts.osuosl.org,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Jakub Kicinski <kuba@...nel.org>, linux-can@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Yajun Deng <yajun.deng@...ux.dev>
Subject: Re: [syzbot] kernel BUG in pskb_expand_head

On 05.01.2022 05:59:35, Eric Dumazet wrote:
> On Wed, Jan 5, 2022 at 3:20 AM syzbot
> <syzbot+4c63f36709a642f801c5@...kaller.appspotmail.com> wrote:
> >
> > syzbot has found a reproducer for the following issue on:
> >
> > HEAD commit:    c9e6606c7fe9 Linux 5.16-rc8
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=148351c3b00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=32f9fa260d7413b4
> > dashboard link: https://syzkaller.appspot.com/bug?extid=4c63f36709a642f801c5
> > compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15435e2bb00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12f4508db00000
> >
> 
> This C repro looks legit, bug should be in CAN layer.

ACK - it's bug in CAN's ISOTP

> > The issue was bisected to:
> >
> > commit e4b8954074f6d0db01c8c97d338a67f9389c042f
> > Author: Eric Dumazet <edumazet@...gle.com>
> > Date:   Tue Dec 7 01:30:37 2021 +0000
> >
> >     netlink: add net device refcount tracker to struct ethnl_req_info
> 
> Ignore this bisection, an unrelated commit whent in its way.

ACK - We have a RFC fix for this:

https://lore.kernel.org/all/20220105132429.1170627-1-mkl@pengutronix.de

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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