diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 7eb252d..50c74cd 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -599,6 +599,7 @@ int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 	hlen = iph->ihl * 4;
 	mtu = mtu - hlen;	/* Size of data space */
 	IPCB(skb)->flags |= IPSKB_FRAG_COMPLETE;
+	ll_rs = LL_RESERVED_SPACE(rt->dst.dev);
 
 	/* When frag_list is given, use it. First, check its validity:
 	 * some transformers could create wrong frag_list or break existing
@@ -614,14 +615,15 @@ int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 		if (first_len - hlen > mtu ||
 		    ((first_len - hlen) & 7) ||
 		    ip_is_fragment(iph) ||
-		    skb_cloned(skb))
+		    skb_cloned(skb) ||
+		    skb_headroom(skb) < ll_rs)
 			goto slow_path;
 
 		skb_walk_frags(skb, frag) {
 			/* Correct geometry. */
 			if (frag->len > mtu ||
 			    ((frag->len & 7) && frag->next) ||
-			    skb_headroom(frag) < hlen)
+			    skb_headroom(frag) < hlen + ll_rs)
 				goto slow_path_clean;
 
 			/* Partially cloned skb? */
@@ -711,8 +713,6 @@ int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 	left = skb->len - hlen;		/* Space per frame */
 	ptr = hlen;		/* Where to start from */
 
-	ll_rs = LL_RESERVED_SPACE(rt->dst.dev);
-
 	/*
 	 *	Fragment the datagram.
 	 */