linux-kernel - [072/114] act_nat: fix wild pointer

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Message-Id: <20100824224507.507205186@clark.site>
Date:	Tue, 24 Aug 2010 15:45:17 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Changli Gao <xiaosuo@...il.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>
Subject: [072/114] act_nat: fix wild pointer

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------


From: Changli Gao <xiaosuo@...il.com>

[ Upstream commit 072d79a31a3b870b49886f4347e23f81b7eca3ac ]

pskb_may_pull() may change skb pointers, so adjust icmph after pskb_may_pull().

Signed-off-by: Changli Gao <xiaosuo@...il.com>
Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/sched/act_nat.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/sched/act_nat.c
+++ b/net/sched/act_nat.c
@@ -218,6 +218,7 @@ static int tcf_nat(struct sk_buff *skb,
 		if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + sizeof(*iph)))
 			goto drop;
 
+		icmph = (void *)(skb_network_header(skb) + ihl);
 		iph = (void *)(icmph + 1);
 		if (egress)
 			addr = iph->daddr;


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