tcp: md5: Handle RCU dereference of md5sig_info

Dereference tp->md5sig_info in tcp_v4_destroy_sock() the same way it is
done in the adjacent call to tcp_clear_md5_list().

Resolves this sparse warning:

net/ipv4/tcp_ipv4.c:1914:17: warning: incorrect type in argument 1 (different address spaces)
net/ipv4/tcp_ipv4.c:1914:17:    expected struct callback_head *head
net/ipv4/tcp_ipv4.c:1914:17:    got struct callback_head [noderef] <asn:4>*<noident>

Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Acked-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index dd945b114215..5d203248123e 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1911,7 +1911,7 @@ void tcp_v4_destroy_sock(struct sock *sk)
         /* Clean up the MD5 key list, if any */
         if (tp->md5sig_info) {
                 tcp_clear_md5_list(sk);
-                kfree_rcu(tp->md5sig_info, rcu);
+                kfree_rcu(rcu_dereference_protected(tp->md5sig_info, 1), rcu);
                 tp->md5sig_info = NULL;
         }
 #endif