[IPSEC]: Fix reversed ICMP6 policy check

The policy check I added for ICMP on IPv6 is reversed.  This
patch fixes that.

It also adds an skb->sp check so that unprotected packets that
fail the policy check do not crash the machine.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 3c41a6f7e6ec..c41f3cc4fba8 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -977,7 +977,7 @@ 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) &&
+        if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb) && skb->sp &&
             skb->sp->xvec[skb->sp->len - 1]->props.flags & XFRM_STATE_ICMP) {
                 int nh;