ipv6: fix headroom calculation in udp6_ufo_fragment

Commit 1e2bd517c108816220f262d7954b697af03b5f9c ("udp6: Fix udp
fragmentation for tunnel traffic.") changed the calculation if
there is enough space to include a fragment header in the skb from a
skb->mac_header dervived one to skb_headroom. Because we already peeled
off the skb to transport_header this is wrong. Change this back to check
if we have enough room before the mac_header.

This fixes a panic Saran Neti reported. He used the tbf scheduler which
skb_gso_segments the skb. The offsets get negative and we panic in memcpy
because the skb was erroneously not expanded at the head.

Reported-by: Saran Neti <Saran.Neti@telus.com>
Cc: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index 08e23b0bf302e93c27c74a3cd8dfc5213c453c6e..e7359f9eaa8d4dd14b706afc9c7241c85e52d056 100644 (file)
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -90,7 +90,7 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
 
                /* Check if there is enough headroom to insert fragment header. */
                tnl_hlen = skb_tnl_header_len(skb);
-               if (skb_headroom(skb) < (tnl_hlen + frag_hdr_sz)) {
+               if (skb->mac_header < (tnl_hlen + frag_hdr_sz)) {
                        if (gso_pskb_expand_head(skb, tnl_hlen + frag_hdr_sz))
                                goto out;
                }