vserver 1.9.3

[linux-2.6.git] / net / ipv4 / netfilter / ipt_ah.c

diff --git a/net/ipv4/netfilter/ipt_ah.c b/net/ipv4/netfilter/ipt_ah.c
index 1f0d765..a0fea84 100644 (file)
--- a/net/ipv4/netfilter/ipt_ah.c
+++ b/net/ipv4/netfilter/ipt_ah.c
@@ -43,23 +43,26 @@ match(const struct sk_buff *skb,
       int offset,
       int *hotdrop)
 {
-       struct ip_auth_hdr ah;
+       struct ip_auth_hdr _ahdr, *ah;
        const struct ipt_ah *ahinfo = matchinfo;
 
        /* Must not be a fragment. */
        if (offset)
                return 0;
 
-       if (skb_copy_bits(skb, skb->nh.iph->ihl*4, &ah, sizeof(ah)) < 0) {
+       ah = skb_header_pointer(skb, skb->nh.iph->ihl * 4,
+                               sizeof(_ahdr), &_ahdr);
+       if (ah == NULL) {
                /* We've been asked to examine this packet, and we
-                  can't.  Hence, no choice but to drop. */
+                * can't.  Hence, no choice but to drop.
+                */
                duprintf("Dropping evil AH tinygram.\n");
                *hotdrop = 1;
                return 0;
        }
 
        return spi_match(ahinfo->spis[0], ahinfo->spis[1],
-                        ntohl(ah.spi),
+                        ntohl(ah->spi),
                         !!(ahinfo->invflags & IPT_AH_INV_SPI));
 }