[IPV6] XFRM: Don't use old copy of pointer after pskb_may_pull().

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 91cce8b2d7a..588922bd926 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -193,7 +193,7 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl)
 {
         u16 offset = sizeof(struct ipv6hdr);
         struct ipv6hdr *hdr = skb->nh.ipv6h;
-        struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
+        struct ipv6_opt_hdr *exthdr;
         u8 nexthdr = skb->nh.ipv6h->nexthdr;
 
         memset(fl, 0, sizeof(struct flowi));
@@ -201,6 +201,8 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl)
         ipv6_addr_copy(&fl->fl6_src, &hdr->saddr);
 
         while (pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) {
+                exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
+
                 switch (nexthdr) {
                 case NEXTHDR_ROUTING:
                 case NEXTHDR_HOP: