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

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Message-Id: <20140324.151417.474668383309974516.davem@davemloft.net>
Date:	Mon, 24 Mar 2014 15:14:17 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	asuka.com@....com
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()

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.

I'm not applying this patch.
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