Re: [PATCH 1/2 net] ip_gre: add validation for csum_start

[Willem de Bruijn]

On Sat, Aug 21, 2021 at 3:14 AM Shreyansh Chouhan
<chouhan.shreyansh630@xxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Shreyansh Chouhan <chouhan.shreyansh630@xxxxxxxxx>

Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>