[Bluetooth] Prevent RFCOMM connections through the RAW socket

This patch adds additional checks to prevent RFCOMM connections be
established through the RAW socket interface.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 25 insertions, 5 deletions

diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 90e19eb6d3cc..f49e7e938bfb 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -363,6 +363,11 @@ static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr
                 goto done;
         }
 
+        if (sk->sk_type != SOCK_STREAM) {
+                err = -EINVAL;
+                goto done;
+        }
+
         write_lock_bh(&rfcomm_sk_list.lock);
 
         if (sa->rc_channel && __rfcomm_get_sock_by_addr(sa->rc_channel, &sa->rc_bdaddr)) {
@@ -393,13 +398,17 @@ static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int a
         if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_rc))
                 return -EINVAL;
 
-        if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
-                return -EBADFD;
+        lock_sock(sk);
 
-        if (sk->sk_type != SOCK_STREAM)
-                return -EINVAL;
+        if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) {
+                err = -EBADFD;
+                goto done;
+        }
 
-        lock_sock(sk);
+        if (sk->sk_type != SOCK_STREAM) {
+                err = -EINVAL;
+                goto done;
+        }
 
         sk->sk_state = BT_CONNECT;
         bacpy(&bt_sk(sk)->dst, &sa->rc_bdaddr);
@@ -410,6 +419,7 @@ static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int a
                 err = bt_sock_wait_state(sk, BT_CONNECTED,
                                 sock_sndtimeo(sk, flags & O_NONBLOCK));
 
+done:
         release_sock(sk);
         return err;
 }
@@ -428,6 +438,11 @@ static int rfcomm_sock_listen(struct socket *sock, int backlog)
                 goto done;
         }
 
+        if (sk->sk_type != SOCK_STREAM) {
+                err = -EINVAL;
+                goto done;
+        }
+
         if (!rfcomm_pi(sk)->channel) {
                 bdaddr_t *src = &bt_sk(sk)->src;
                 u8 channel;
@@ -472,6 +487,11 @@ static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int f
                 goto done;
         }
 
+        if (sk->sk_type != SOCK_STREAM) {
+                err = -EINVAL;
+                goto done;
+        }
+
         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 
         BT_DBG("sk %p timeo %ld", sk, timeo);