From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Mon, 15 Oct 2007 08:46:08 +0000 (-0700)
Subject: [NET]: Fix csum_start update in pskb_expand_head
X-Git-Tag: firefly_0821_release~25893^2~25
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=172a863f2bfbacf4b6bfc06db219b946a058ce1a;p=firefly-linux-kernel-4.4.55.git

[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 c3aa68ceed62..70d9b5da96ae 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -682,7 +682,7 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
 	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;