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

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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.

Based upon analysis and initial patch by Rodrigo Partearroyo González.

Signed-off-by: Changli Gao <[email protected]>
Acked-by: Herbert Xu <[email protected]>
----
 net/sched/act_nat.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Changli Gao 2010-07-09 15:33:25 +00:00 • committed by David S. Miller
commit 70c2efa5a3
1 changed files with 4 additions and 1 deletions
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5
net/sched/act_nat.c
View file

@ -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;