tunneling: Refresh IP header pointer after update_header().

We were assuming that the call to update_header() to finalize tunnel
headers wouldn't cause the skb linear data area to be reallocated.
So far this hasn't been a problem but it's not, generally speaking,
a good assumption to make.  Therefore, refetch the pointer to the IP
header instead of carrying it across the call.

Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>

diff --git a/datapath/tunnel.c b/datapath/tunnel.c
index bf66f4f..eac3fa3 100644 (file)
--- a/datapath/tunnel.c
+++ b/datapath/tunnel.c
@@ -1284,6 +1284,7 @@ int tnl_send(struct vport *vport, struct sk_buff *skb)
                        struct vport *cache_vport = internal_dev_get_vport(rt_dst(rt).dev);
 
                        skb->protocol = htons(ETH_P_IP);
+                       iph = ip_hdr(skb);
                        iph->tot_len = htons(skb->len - skb_network_offset(skb));
                        ip_send_check(iph);