ipv4: Fix ip_local_out_sk by passing the sk into __ip_local_out_sk

commit fd2874b3 upstream.

In the rare case where sk != skb->sk ip_local_out_sk arranges
to call dst->output differently if the skb is queued or not.
This is a bug.

Fix this bug by passing the sk parameter of ip_local_out_sk through
from ip_local_out_sk to __ip_local_out_sk (skipping __ip_local_out).

Fixes: 7026b1dd ("netfilter: Pass socket pointer down through okfn().")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

net/ipv4/ip_output.c

@@ -114,7 +114,7 @@ int ip_local_out_sk(struct sock *sk, struct sk_buff *skb)
 {
 	int err;
 
-	err = __ip_local_out(skb);
+	err = __ip_local_out_sk(sk, skb);
 	if (likely(err == 1))
 		err = dst_output_sk(sk, skb);