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

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

From: Hannes Frederic Sowa <[email protected]>

Signed-off-by: Hannes Frederic Sowa <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 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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