[PATCH 4.4 001/342] af_iucv: Validate socket address length in iucv_sock_bind()

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ursula Braun <redacted>

[ Upstream commit 52a82e23b9f2a9e1d429c5207f8575784290d008 ]

Signed-off-by: Ursula Braun <redacted>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Evgeny Cherkashin <redacted>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/iucv/af_iucv.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c

@@ -708,6 +708,9 @@ static int iucv_sock_bind(struct socket
 	if (!addr || addr->sa_family != AF_IUCV)
 		return -EINVAL;
 
+	if (addr_len < sizeof(struct sockaddr_iucv))
+		return -EINVAL;
+
 	lock_sock(sk);
 	if (sk->sk_state != IUCV_OPEN) {
 		err = -EBADFD;