static int yurex_fasync(int fd, struct file *file, int on)
{
	struct usb_yurex *dev;

	dev = file->private_data;
	return fasync_helper(fd, file, on, &dev->async_queue);
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.