[IPV6]: skb leakage in inet6_csk_xmit

inet6_csk_xit does not free skb when routing fails.
Signed-off-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/inet6_connection_sock.c

@@ -173,6 +173,7 @@ int inet6_csk_xmit(struct sk_buff *skb, int ipfragok)
 
 		if (err) {
 			sk->sk_err_soft = -err;
+			kfree_skb(skb);
 			return err;
 		}
 
@@ -181,6 +182,7 @@ int inet6_csk_xmit(struct sk_buff *skb, int ipfragok)
 
 		if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
 			sk->sk_route_caps = 0;
+			kfree_skb(skb);
 			return err;
 		}