af_iucv: Validate socket address length in iucv_sock_bind()

[ Upstream commit 52a82e23b9f2a9e1d429c5207f8575784290d008 ]

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Evgeny Cherkashin <Eugene.Crosser@ru.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 1465363a452bc11d5c79cdad2da90d15bd67797b..bb3969a40b8e96fa1b59f89a9f9d3e0c6f749964 100644 (file)
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -697,6 +697,9 @@ 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;