USB: serial: opticon: fix control-message timeouts

The driver was issuing synchronous uninterruptible control requests
without using a timeout. This could lead to the driver hanging
on open() or tiocmset() due to a malfunctioning (or malicious) device
until the device is physically disconnected.

The USB upper limit of five seconds per request should be more than
enough.

Fixes: 4c9d55ae7590 ("USB: opticon: add rts and cts support")
Cc: stable <stable@vger.kernel.org>     # 2.6.39
Cc: Martin Jansen <martin.jansen@opticon.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>

diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index cb7aac9cd9e72aadac7bc474ffecc4b57e88e828..ed2b4e6dca385bf4d6ae234e83bf11dd3e76df85 100644 (file)
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -113,7 +113,7 @@ static int send_control_msg(struct usb_serial_port *port, u8 requesttype,
        retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
                                requesttype,
                                USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
-                               0, 0, buffer, 1, 0);
+                               0, 0, buffer, 1, USB_CTRL_SET_TIMEOUT);
        kfree(buffer);
 
        if (retval < 0)