diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 8178c44a3cdd..e13244729ad8 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -891,10 +891,17 @@ static int ipgre_header(struct sk_buff *skb, struct net_device *dev,
 			const void *daddr, const void *saddr, unsigned int len)
 {
 	struct ip_tunnel *t = netdev_priv(dev);
-	struct iphdr *iph;
 	struct gre_base_hdr *greh;
+	struct iphdr *iph;
+	int needed;
 
-	iph = skb_push(skb, t->hlen + sizeof(*iph));
+	needed = t->hlen + sizeof(*iph);
+	if (skb_headroom(skb) < needed &&
+	    pskb_expand_head(skb, HH_DATA_ALIGN(needed - skb_headroom(skb)),
+			     0, GFP_ATOMIC))
+		return -needed;
+
+	iph = skb_push(skb, needed);
 	greh = (struct gre_base_hdr *)(iph+1);
 	greh->flags = gre_tnl_flags_to_gre_flags(t->parms.o_flags);
 	greh->protocol = htons(type);