--- linux/net/ipv4/ip_gre.c.old_iph	Sat Jul 12 11:09:29 2003
+++ linux/net/ipv4/ip_gre.c	Wed Jul 16 02:12:56 2003
@@ -816,6 +816,7 @@
 			skb_set_owner_w(new_skb, skb->sk);
 		dev_kfree_skb(skb);
 		skb = new_skb;
+		old_iph = skb->nh.iph;
 	}
 
 	skb->nh.raw = skb_push(skb, gre_hlen);