commit be2b6e62357dd7ee56bdcb05e54002afb4830292
author David S. Miller <davem@davemloft.net> Thu Jul 22 13:27:09 2010 -0700
committer David S. Miller <davem@davemloft.net> Thu Jul 22 13:27:09 2010 -0700
tree 7a166ad319bad5756a49beb060b91234a3de5510
parent 00c5a9834b476a138158fb17d576da751727a9f1

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>

net/core/skbuff.c

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index c699159..ce88293 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -932,7 +932,8 @@
 	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;