netdev - Re: [PATCH 1/2 net] ip_gre: add validation for csum

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Message-ID: <CA+FuTSeWY-0+VtERqAxNwmHAwmarYh_HQUoF3b0wHiwAaL+h+A@mail.gmail.com>
Date:   Sat, 21 Aug 2021 09:41:14 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Shreyansh Chouhan <chouhan.shreyansh630@...il.com>
Cc:     davem@...emloft.net, yoshfuji@...ux-ipv6.org, dsahern@...nel.org,
        kuba@...nel.org, pshelar@...ira.com,
        willemdebruijn.kernel@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        syzbot+ff8e1b9f2f36481e2efc@...kaller.appspotmail.com
Subject: Re: [PATCH 1/2 net] ip_gre: add validation for csum_start

On Sat, Aug 21, 2021 at 3:14 AM Shreyansh Chouhan
<chouhan.shreyansh630@...il.com> wrote:
>
> Validate csum_start in gre_handle_offloads before we call _gre_xmit so
> that we do not crash later when the csum_start value is used in the
> lco_csum function call.
>
> This patch deals with ipv4 code.
>
> Fixes: c54419321455 ("GRE: Refactor GRE tunneling code.")
> Reported-by: syzbot+ff8e1b9f2f36481e2efc@...kaller.appspotmail.com
> Signed-off-by: Shreyansh Chouhan <chouhan.shreyansh630@...il.com>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>