netdev - Re: [PATCH] ipv4: gre: Fix null pointer dereference in gre_cisco

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Message-ID: <232812eb.b291.144f87462d4.Coremail.asuka.com@163.com>
Date:	Tue, 25 Mar 2014 16:56:20 +0800 (CST)
From:	"wei zhang" <asuka.com@....com>
To:	"David Miller" <davem@...emloft.net>
Cc:	xeb@...l.ru, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipv4: gre: Fix null pointer dereference in
 gre_cisco_err()

At 2014-03-25 03:14:17,"David Miller" <davem@...emloft.net> wrote:
>From: Wei Zhang <asuka.com@....com>
>Date: Mon, 24 Mar 2014 15:34:31 +0800
>
>> When use the gre vport, openvswitch register a gre_cisco_protocol but
>> does not supply a err_handler with it. The gre_cisco_err() call the
>> err_handler without existence check, cause the kernel crash.
>> 
>> This patch base on v3.14-rc7. But the bug affect all kernel newer than
>> 3.11!
>> 
>> Signed-off-by: Wei Zhang <asuka.com@....com>
>
>Rather, openvswitch should provide an appropriate ->err_handler() that
>returns PACKET_RCVD or PACKET_REJECT.

Thank you for your explanation, I misunderstand it .
I'm very sorry about this bothering!

>
>I'm not applying this patch.