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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2007-12-12 18:54:16 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 14:57:43 -0800 |
| commit | aebcf82c1fe9231be5cb4f9c1362d5db39e7d7b2 (patch) | |
| tree | f164bead26b172ee82d6eaa81a0148d980985bce /net/ipv4/icmp.c | |
| parent | bb72845e699d3c84e5f861b51db686107a51dea5 (diff) | |
| download | lwn-aebcf82c1fe9231be5cb4f9c1362d5db39e7d7b2.tar.gz lwn-aebcf82c1fe9231be5cb4f9c1362d5db39e7d7b2.zip | |
[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 <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/icmp.c')
| -rw-r--r-- | net/ipv4/icmp.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index c41f3cc4fba8..ce5b4be559aa 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; |