diff --git a/drivers/usb/serial/belkin_sa.c b/drivers/usb/serial/belkin_sa.c
index 38ac910b1082..7bbd9523d4e9 100644
--- a/drivers/usb/serial/belkin_sa.c
+++ b/drivers/usb/serial/belkin_sa.c
@@ -194,6 +194,9 @@ static void belkin_sa_read_int_callback(struct urb *urb)
 
 	usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 
+	if (urb->actual_length < BELKIN_SA_MSR_INDEX + 1)
+		goto exit;
+
 	/* Handle known interrupt data */
 	/* ignore data[0] and data[1] */