===== net/ipv4/tcp_output.c 1.67 vs edited =====
--- 1.67/net/ipv4/tcp_output.c	2004-10-01 13:56:45 +10:00
+++ edited/net/ipv4/tcp_output.c	2004-10-17 18:58:47 +10:00
@@ -455,8 +455,12 @@
 {
 	struct tcp_opt *tp = tcp_sk(sk);
 	struct sk_buff *buff;
-	int nsize = skb->len - len;
+	int nsize;
 	u16 flags;
+
+	nsize = skb_headlen(skb) - len;
+	if (nsize < 0)
+		nsize = 0;
 
 	if (skb_cloned(skb) &&
 	    skb_is_nonlinear(skb) &&