[PATCH 3.16.y-ckt 058/142] af_iucv: Validate socket address length in iucv_sock_bind()

[Luis Henriques]

3.16.7-ckt26 -stable review patch.  If anyone has any objections, please let me 
know.

---8<------------------------------------------------------------

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

commit 52a82e23b9f2a9e1d429c5207f8575784290d008 upstream.

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: Luis Henriques <luis.henriq...@canonical.com>
---
 net/iucv/af_iucv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 7a95fa4a3de1..f521848e26c7 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -709,6 +709,9 @@ static int iucv_sock_bind(struct socket *sock, struct 
sockaddr *addr,
        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;