diff --git a/[refs] b/[refs]
index 803343a82781..4637e1ae2776 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 12a169e7d8f4b1c95252d8b04ed0f1033ed7cfe2
+refs/heads/master: 4edd87ad5cad8e159e0db3ce3131b3d97219c9cd
diff --git a/trunk/net/core/skbuff.c b/trunk/net/core/skbuff.c
index 2c218a0808b4..8bd248a64879 100644
--- a/trunk/net/core/skbuff.c
+++ b/trunk/net/core/skbuff.c
@@ -738,6 +738,8 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
 #endif
 	long off;
 
+	BUG_ON(nhead < 0);
+
 	if (skb_shared(skb))
 		BUG();