linux-kernel - Re: [PATCH v3,net-next 1/2] ip_gre: fix parsing gre header in ipgre

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Date:   Sun, 16 Sep 2018 15:34:27 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     yanhaishuang@...s.chinamobile.com
Cc:     kuznet@....inr.ac.ru, jbenc@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3,net-next 1/2] ip_gre: fix parsing gre header in
 ipgre_err

From: Haishuang Yan <yanhaishuang@...s.chinamobile.com>
Date: Fri, 14 Sep 2018 12:26:47 +0800

> gre_parse_header stops parsing when csum_err is encountered, which means
> tpi->key is undefined and ip_tunnel_lookup will return NULL improperly.
> 
> This patch introduce a NULL pointer as csum_err parameter. Even when
> csum_err is encountered, it won't return error and continue parsing gre
> header as expected.
> 
> Fixes: 9f57c67c379d ("gre: Remove support for sharing GRE protocol hook.")
> Reported-by: Jiri Benc <jbenc@...hat.com>
> Signed-off-by: Haishuang Yan <yanhaishuang@...s.chinamobile.com>
> 
> ---
> Changes since v3:
>   * skb_checksum_simple_validate need to be performed in csum_err case.

Applied.