Index: usb-devel/drivers/usb/gadget/udc/dummy_hcd.c
===================================================================
--- usb-devel.orig/drivers/usb/gadget/udc/dummy_hcd.c
+++ usb-devel/drivers/usb/gadget/udc/dummy_hcd.c
@@ -522,6 +522,8 @@ static int dummy_enable(struct usb_ep *_
 	 * For SS devices the wMaxPacketSize is limited by 1024.
 	 */
 	max = usb_endpoint_maxp(desc);
+	if (max == 0)
+		return -EINVAL;
 
 	/* drivers must not request bad settings, since lower levels
 	 * (hardware or its drivers) may not check.  some endpoints