From: Changli Gao Date: Fri, 9 Jul 2010 15:33:25 +0000 (+0000) Subject: act_nat: not all of the ICMP packets need an IP header payload X-Git-Tag: v3.0~4197^2~29 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=70c2efa5a32a7d38e66224844032160317fa7887;p=platform%2Fkernel%2Flinux-amlogic.git 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. Based upon analysis and initial patch by Rodrigo Partearroyo González. Signed-off-by: Changli Gao Acked-by: Herbert Xu ---- net/sched/act_nat.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) Signed-off-by: David S. Miller --- diff --git a/net/sched/act_nat.c b/net/sched/act_nat.c index 5709494..724553e 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;