linux-kernel - Re: [PATCH net] net: flow_dissector: fail on evil iph->ihl

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Message-Id: <20131102.021651.96548203258073968.davem@davemloft.net>
Date:	Sat, 02 Nov 2013 02:16:51 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	jasowang@...hat.com
Cc:	edumazet@...gle.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, pmatouse@...hat.com, mst@...hat.com,
	dborkman@...hat.com
Subject: Re: [PATCH net] net: flow_dissector: fail on evil iph->ihl

From: Jason Wang <jasowang@...hat.com>
Date: Fri,  1 Nov 2013 15:01:10 +0800

> We don't validate iph->ihl which may lead a dead loop if we meet a IPIP
> skb whose iph->ihl is zero. Fix this by failing immediately when iph->ihl
> is evil (less than 5).
> 
> This issue were introduced by commit ec5efe7946280d1e84603389a1030ccec0a767ae
> (rps: support IPIP encapsulation).
> 
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Petr Matousek <pmatouse@...hat.com>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Cc: Daniel Borkmann <dborkman@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied and queued up for -stable, thanks Jason.
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