Bluetooth: Check address length before reading address field

KMSAN will complain if valid address length passed to bind() is shorter
than sizeof(struct sockaddr_sco) bytes.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 9a58099..d892b7c 100644 (file)
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -523,12 +523,12 @@ static int sco_sock_bind(struct socket *sock, struct sockaddr *addr,
        struct sock *sk = sock->sk;
        int err = 0;
 
-       BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
-
        if (!addr || addr_len < sizeof(struct sockaddr_sco) ||
            addr->sa_family != AF_BLUETOOTH)
                return -EINVAL;
 
+       BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
+
        lock_sock(sk);
 
        if (sk->sk_state != BT_OPEN) {