USB: mxuport: fix null deref when used as a console

Fix null-pointer dereference at probe when the device is used as a
console, in which case the tty argument to open will be NULL.

Fixes: ee467a1f2066 ("USB: serial: add Moxa UPORT 12XX/14XX/16XX
driver")
Cc: stable <stable@vger.kernel.org>	# v3.14
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Greg Kroah-Hartman <greg@kroah.com>

diff --git a/drivers/usb/serial/mxuport.c b/drivers/usb/serial/mxuport.c
index ab1d690274ae52b3230f04acbd8194a49f68b7ba..460a40669967855cfeea7c6cc911064822c6882a 100644 (file)
--- a/drivers/usb/serial/mxuport.c
+++ b/drivers/usb/serial/mxuport.c
@@ -1284,7 +1284,8 @@ static int mxuport_open(struct tty_struct *tty, struct usb_serial_port *port)
        }
 
        /* Initial port termios */
-       mxuport_set_termios(tty, port, NULL);
+       if (tty)
+               mxuport_set_termios(tty, port, NULL);
 
        /*
         * TODO: use RQ_VENDOR_GET_MSR, once we know what it