From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v3,net-next 1/2] ip_gre: fix parsing gre header in
 ipgre_err
Date: Sun, 16 Sep 2018 15:34:27 -0700 (PDT)
Message-ID: <20180916.153427.1678835674354962099.davem@davemloft.net>
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From: Haishuang Yan <yanhaishuang@cmss.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@redhat.com>
> Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
> 
> ---
> Changes since v3:
>   * skb_checksum_simple_validate need to be performed in csum_err case.

Applied.