diff -urN linux.orig/net/core/skbuff.c linux/net/core/skbuff.c
--- linux.orig/net/core/skbuff.c	Fri Nov  1 17:20:26 2002
+++ linux/net/core/skbuff.c	Fri Nov  1 17:27:48 2002
@@ -333,13 +333,16 @@
 {
 	struct sk_buff *n;
 	unsigned long offset;
-	int headroom = skb_headroom(skb);
+	int delta = newheadroom - skb_headroom(skb);
+
+	if (delta <= 0)
+		delta = 0;
 
 	/*
 	 *	Allocate the copy buffer
 	 */
  	 
-	n=alloc_skb(skb->truesize+newheadroom-headroom, GFP_ATOMIC);
+	n=alloc_skb(skb->truesize + delta, GFP_ATOMIC);
 	if(n==NULL)
 		return NULL;