1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index 4446b8d70ac2..885655315de1 100644
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -376,14 +376,21 @@ static void mct_u232_msr_to_state(struct usb_serial_port *port,
 
 static int mct_u232_port_probe(struct usb_serial_port *port)
 {
+        struct usb_serial *serial = port->serial;
         struct mct_u232_private *priv;
 
+        /* check first to simplify error handling */
+        if (!serial->port[1] || !serial->port[1]->interrupt_in_urb) {
+                dev_err(&port->dev, "expected endpoint missing\n");
+                return -ENODEV;
+        }
+
         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
         if (!priv)
                 return -ENOMEM;
 
         /* Use second interrupt-in endpoint for reading. */
-        priv->read_urb = port->serial->port[1]->interrupt_in_urb;
+        priv->read_urb = serial->port[1]->interrupt_in_urb;
         priv->read_urb->context = port;
 
         spin_lock_init(&priv->lock);