diff --git a/net/core/datagram.c b/net/core/datagram.c
index 186212b..cb056f4 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -411,11 +411,11 @@
 	return -EFAULT;
 }
 
-__sum16 __skb_checksum_complete(struct sk_buff *skb)
+__sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len)
 {
 	__sum16 sum;
 
-	sum = csum_fold(skb_checksum(skb, 0, skb->len, skb->csum));
+	sum = csum_fold(skb_checksum(skb, 0, len, skb->csum));
 	if (likely(!sum)) {
 		if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE))
 			netdev_rx_csum_fault(skb->dev);
@@ -423,6 +423,12 @@
 	}
 	return sum;
 }
+EXPORT_SYMBOL(__skb_checksum_complete_head);
+
+__sum16 __skb_checksum_complete(struct sk_buff *skb)
+{
+	return __skb_checksum_complete_head(skb, skb->len);
+}
 EXPORT_SYMBOL(__skb_checksum_complete);
 
 /**