netdev - [PATCH] act_nat: not all of the ICMP packets need an IP header payload

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Message-Id: <1278725605-28598-1-git-send-email-xiaosuo@gmail.com>
Date:	Sat, 10 Jul 2010 09:33:25 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Jamal Hadi Salim <hadi@...erus.ca>,
	Rodrigo Partearroyo González 
	<rpartearroyo@...entia.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Iratxo Pichel Ortiz <ipichel@...entia.com>,
	Noelia Morón <nmoron@...entia.com>,
	netdev@...r.kernel.org, Changli Gao <xiaosuo@...il.com>
Subject: [PATCH] act_nat: not all of the ICMP packets need an IP header payload

act_nat: not all of the ICMP packets need an IP header payload

not all of the ICMP packets need an IP header payload, so we check the length
of the skbs only when the packets should have an IP header payload.

Signed-off-by: Changli Gao <xiaosuo@...il.com>
----
 net/sched/act_nat.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/sched/act_nat.c b/net/sched/act_nat.c
index 0be49a4..24e614c 100644
--- a/net/sched/act_nat.c
+++ b/net/sched/act_nat.c
@@ -205,7 +205,7 @@ static int tcf_nat(struct sk_buff *skb, struct tc_action *a,
 	{
 		struct icmphdr *icmph;
 
-		if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + sizeof(*iph)))
+		if (!pskb_may_pull(skb, ihl + sizeof(*icmph)))
 			goto drop;
 
 		icmph = (void *)(skb_network_header(skb) + ihl);
@@ -215,6 +215,9 @@ static int tcf_nat(struct sk_buff *skb, struct tc_action *a,
 		    (icmph->type != ICMP_PARAMETERPROB))
 			break;
 
+		if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + sizeof(*iph)))
+			goto drop;
+
 		iph = (void *)(icmph + 1);
 		if (egress)
 			addr = iph->daddr;
--
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