On Thu, Dec 13, 2007 at 09:58:56AM +0800, Herbert Xu wrote:
>
> [IPSEC]: Fix reversed ICMP6 policy check
While that won't crash anymore, it's still logically wrong.
Here's a more complete fix.
[IPSEC]: Fix reversed ICMP6 policy check
The policy check I added for ICMP on IPv6 is reversed. We were also
letting packets through incorrectly if the ICMP flag isn't set. 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 <[EMAIL PROTECTED]>
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 4e3bfcd..ccdef9a 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -978,10 +978,13 @@ 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->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 478ee77..bbf4162 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -646,10 +646,13 @@ static int icmpv6_rcv(struct sk_buff *skb)
struct icmp6hdr *hdr;
int type;
- if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb) &&
- skb->sp->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;
Thanks,
--
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <[EMAIL PROTECTED]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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