void usb_disconnect(struct usb_device **pdev)
{
	struct usb_port *port_dev = NULL;
	struct usb_device *udev = *pdev;
	struct usb_hub *hub = NULL;
	int port1 = 1;

	/* mark the device as inactive, so any further urb submissions for
	 * this device (and any of its children) will fail immediately.
	 * this quiesces everything except pending urbs.
	 */
	usb_set_device_state(udev, USB_STATE_NOTATTACHED);
	dev_info(&udev->dev, "USB disconnect, device number %d\n",
			udev->devnum);

	/*
	 * Ensure that the pm runtime code knows that the USB device
	 * is in the process of being disconnected.
	 */
	pm_runtime_barrier(&udev->dev);

	usb_lock_device(udev);

	hub_disconnect_children(udev);

	/* deallocate hcd/hardware state ... nuking all pending urbs and
	 * cleaning up all state associated with the current configuration
	 * so that the hardware is now fully quiesced.
	 */
	dev_dbg(&udev->dev, "unregistering device\n");
	usb_disable_device(udev, 0);
	usb_hcd_synchronize_unlinks(udev);

	if (udev->parent) {
		port1 = udev->portnum;
		hub = usb_hub_to_struct_hub(udev->parent);
		port_dev = hub->ports[port1 - 1];

		sysfs_remove_link(&udev->dev.kobj, "port");
		sysfs_remove_link(&port_dev->dev.kobj, "device");

		/*
		 * As usb_port_runtime_resume() de-references udev, make
		 * sure no resumes occur during removal
		 */
		if (!test_and_set_bit(port1, hub->child_usage_bits))
			pm_runtime_get_sync(&port_dev->dev);
	}

	usb_remove_ep_devs(&udev->ep0);
	usb_unlock_device(udev);

	/* Unregister the device.  The device driver is responsible
	 * for de-configuring the device and invoking the remove-device
	 * notifier chain (used by usbfs and possibly others).
	 */
	device_del(&udev->dev);

	/* Free the device number and delete the parent's children[]
	 * (or root_hub) pointer.
	 */
	release_devnum(udev);

	/* Avoid races with recursively_mark_NOTATTACHED() */
	spin_lock_irq(&device_state_lock);
	*pdev = NULL;
	spin_unlock_irq(&device_state_lock);

	if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits))
		pm_runtime_put(&port_dev->dev);

	hub_free_dev(udev);

	put_device(&udev->dev);
}

The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.