[PATCH 3.18 14/92] Bluetooth: cmtp: cmtp_add_connection() should verify that its dealing with l2cap socket

[Greg Kroah-Hartman]

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

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

From: Al Viro <v...@zeniv.linux.org.uk>

commit 96c26653ce65bf84f3212f8b00d4316c1efcbf4c upstream.

... rather than relying on ciptool(8) never passing it anything else.  Give
it e.g. an AF_UNIX connected socket (from socketpair(2)) and it'll oops,
trying to evaluate &l2cap_pi(sock->sk)->chan->dst...

Signed-off-by: Al Viro <v...@zeniv.linux.org.uk>
Signed-off-by: Marcel Holtmann <mar...@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 net/bluetooth/cmtp/core.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/bluetooth/cmtp/core.c
+++ b/net/bluetooth/cmtp/core.c
@@ -334,6 +334,9 @@ int cmtp_add_connection(struct cmtp_conn
 
        BT_DBG("");
 
+       if (!l2cap_is_socket(sock))
+               return -EBADFD;
+
        session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL);
        if (!session)
                return -ENOMEM;