Check length before submitting sync transfers

usbutils.c

@@ -2436,13 +2436,14 @@ usb_bulk_transfer(struct libusb_device_handle *dev_handle, int intinfo,
 	usb_epinfo = &(cgpu->usbdev->found->intinfos[intinfo].epinfos[epinfo]);
 	endpoint = usb_epinfo->ep;
 
+	if (length > usb_epinfo->wMaxPacketSize)
+		length = usb_epinfo->wMaxPacketSize;
+
 	/* Avoid any async transfers during shutdown to allow the polling
 	 * thread to be shut down after all existing transfers are complete */
 	if (unlikely(cgpu->shutdown))
 		return libusb_bulk_transfer(dev_handle, endpoint, data, length, transferred, timeout);
 
-	if (length > usb_epinfo->wMaxPacketSize)
-		length = usb_epinfo->wMaxPacketSize;
 	if ((endpoint & LIBUSB_ENDPOINT_DIR_MASK) == LIBUSB_ENDPOINT_OUT)
 		memcpy(buf, data, length);