From: David S. Miller <davem@davemloft.net>
Date: Thu, 22 Jul 2010 20:27:09 +0000 (-0700)
Subject: net: Fix skb_copy_expand() handling of ->csum_start
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=be2b6e62357dd7ee56bdcb05e54002afb4830292;p=deliverable%2Flinux.git

net: Fix skb_copy_expand() handling of ->csum_start

It should only be adjusted if ip_summed == CHECKSUM_PARTIAL.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index c699159b3ede..ce88293a34e2 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -932,7 +932,8 @@ struct sk_buff *skb_copy_expand(const struct sk_buff *skb,
 	copy_skb_header(n, skb);
 
 	off                  = newheadroom - oldheadroom;
-	n->csum_start       += off;
+	if (n->ip_summed == CHECKSUM_PARTIAL)
+		n->csum_start += off;
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
 	n->transport_header += off;
 	n->network_header   += off;