static int halt_simple(struct usbtest_dev *dev)
{
	int			ep;
	int			retval = 0;
	struct urb		*urb;
	struct usb_device	*udev = testdev_to_usbdev(dev);

	if (udev->speed == USB_SPEED_SUPER)
		urb = simple_alloc_urb(udev, 0, 1024, 0);
	else
		urb = simple_alloc_urb(udev, 0, 512, 0);
	if (urb == NULL)
		return -ENOMEM;

	if (dev->in_pipe) {
		ep = usb_pipeendpoint(dev->in_pipe) | USB_DIR_IN;
		urb->pipe = dev->in_pipe;
		retval = test_halt(dev, ep, urb);
		if (retval < 0)
			goto done;
	}

	if (dev->out_pipe) {
		ep = usb_pipeendpoint(dev->out_pipe);
		urb->pipe = dev->out_pipe;
		retval = test_halt(dev, ep, urb);
	}
done:
	simple_free_urb(urb);
	return retval;
}

The product dereferences a pointer that it expects to be valid but is NULL.