[NET]: Fix csum_start update in pskb_expand_head
I got confused by the dual nature of the off variable in the
function pskb_expand_head. The csum_start offset should use
nhead instead of off which can change depending on whether we
are using offsets or pointers.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index c3aa68ce..70d9b5d 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -682,7 +682,7 @@
skb->transport_header += off;
skb->network_header += off;
skb->mac_header += off;
- skb->csum_start += off;
+ skb->csum_start += nhead;
skb->cloned = 0;
skb->hdr_len = 0;
skb->nohdr = 0;