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

[Greg Kroah-Hartman]

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

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

From: Ursula Braun <ursula.br...@de.ibm.com>

[ Upstream commit 52a82e23b9f2a9e1d429c5207f8575784290d008 ]

Signed-off-by: Ursula Braun <ursula.br...@de.ibm.com>
Reported-by: Dmitry Vyukov <dvyu...@google.com>
Reviewed-by: Evgeny Cherkashin <eugene.cros...@ru.ibm.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@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;