From aebcf82c1fe9231be5cb4f9c1362d5db39e7d7b2 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Wed, 12 Dec 2007 18:54:16 -0800 Subject: [PATCH] [IPSEC]: Do not let packets pass when ICMP flag is off This fixes a logical error in ICMP policy checks which lets packets through if the state ICMP flag is off. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- net/ipv4/icmp.c | 7 +++++-- net/ipv6/icmp.c | 7 +++++-- 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index c41f3cc4fba..ce5b4be559a 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -977,10 +977,13 @@ int icmp_rcv(struct sk_buff *skb) struct icmphdr *icmph; struct rtable *rt = (struct rtable *)skb->dst; - if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb) && skb->sp && - skb->sp->xvec[skb->sp->len - 1]->props.flags & XFRM_STATE_ICMP) { + if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { int nh; + if (!(skb->sp && skb->sp->xvec[skb->sp->len - 1]->props.flags & + XFRM_STATE_ICMP)) + goto drop; + if (!pskb_may_pull(skb, sizeof(*icmph) + sizeof(struct iphdr))) goto drop; diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c index 1659d2fb01f..c3bbd868730 100644 --- a/net/ipv6/icmp.c +++ b/net/ipv6/icmp.c @@ -644,10 +644,13 @@ static int icmpv6_rcv(struct sk_buff *skb) struct icmp6hdr *hdr; int type; - if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb) && skb->sp && - skb->sp->xvec[skb->sp->len - 1]->props.flags & XFRM_STATE_ICMP) { + if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { int nh; + if (!(skb->sp && skb->sp->xvec[skb->sp->len - 1]->props.flags & + XFRM_STATE_ICMP)) + goto drop_no_count; + if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr))) goto drop_no_count; -- 2.41.0