batman-adv: fix skb->data assignment

commit 2c995ff8 upstream.

skb_linearize(skb) possibly rearranges the skb internal data and then changes
the skb->data pointer value. For this reason any other pointer in the code that
was assigned skb->data before invoking skb_linearise(skb) must be re-assigned.

In the current tt_query message handling code this is not done and therefore, in
case of skb linearization, the pointer used to handle the packet header ends up
in pointing to free'd memory.

This bug was introduced by a73105b8
(batman-adv: improved client announcement mechanism)
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
[This patch is a backport for kernel versions 3.1 and 3.2 - Antonio]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

net/batman-adv/routing.c

@@ -619,6 +619,8 @@ int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if)
 		/* packet needs to be linearized to access the TT changes */
 		if (skb_linearize(skb) < 0)
 			goto out;
+		/* skb_linearize() possibly changed skb->data */
+		tt_query = (struct tt_query_packet *)skb->data;
 
 		if (is_my_mac(tt_query->dst))
 			handle_tt_response(bat_priv, tt_query);