[PATCH 3.12 20/77] ipv6: fix illegal mac_header comparison on 32bit

[Greg Kroah-Hartman]

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>

Signed-off-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/ipv6/udp_offload.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -88,7 +88,7 @@ static struct sk_buff *udp6_ufo_fragment
 
 		/* Check if there is enough headroom to insert fragment header. */
 		tnl_hlen = skb_tnl_header_len(skb);
-		if (skb->mac_header < (tnl_hlen + frag_hdr_sz)) {
+		if (skb_mac_header(skb) < skb->head + tnl_hlen + frag_hdr_sz) {
 			if (gso_pskb_expand_head(skb, tnl_hlen + frag_hdr_sz))
 				goto out;
 		}


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