USB: serial: visor: fix crash on detecting device without write_urbs

commit cb3232138e37129e88240a98a1d2aba2187ff57c upstream.

The visor driver crashes in clie_5_attach() when a specially crafted USB
device without bulk-out endpoint is detected. This fix adds a check that
the device has proper configuration expected by the driver.

Reported-by: Ralf Spenneberg <ralf@spenneberg.net>
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Fixes: cfb8da8f69b8 ("USB: visor: fix initialisation of UX50/TH55 devices")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index 727905de0ba486aacf5a674f046c5f160a4694aa..9c61a8671721003f3b620d99e58c76cf64063c52 100644 (file)
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -604,8 +604,10 @@ static int clie_5_attach(struct usb_serial *serial)
         */
 
        /* some sanity check */
-       if (serial->num_ports < 2)
-               return -1;
+       if (serial->num_bulk_out < 2) {
+               dev_err(&serial->interface->dev, "missing bulk out endpoints\n");
+               return -ENODEV;
+       }
 
        /* port 0 now uses the modified endpoint Address */
        port = serial->port[0];