static void unplug_port(struct port *port)
{
	spin_lock_irq(&port->portdev->ports_lock);
	list_del(&port->list);
	spin_unlock_irq(&port->portdev->ports_lock);

	spin_lock_irq(&port->inbuf_lock);
	if (port->guest_connected) {
		/* Let the app know the port is going down. */
		send_sigio_to_port(port);

		/* Do this after sigio is actually sent */
		port->guest_connected = false;
		port->host_connected = false;

		wake_up_interruptible(&port->waitqueue);
	}
	spin_unlock_irq(&port->inbuf_lock);

	if (is_console_port(port)) {
		spin_lock_irq(&pdrvdata_lock);
		list_del(&port->cons.list);
		spin_unlock_irq(&pdrvdata_lock);
		hvc_remove(port->cons.hvc);
	}

	remove_port_data(port);

	/*
	 * We should just assume the device itself has gone off --
	 * else a close on an open port later will try to send out a
	 * control message.
	 */
	port->portdev = NULL;

	sysfs_remove_group(&port->dev->kobj, &port_attribute_group);
	device_destroy(pdrvdata.class, port->dev->devt);
	cdev_del(port->cdev);

	debugfs_remove(port->debugfs_file);
	kfree(port->name);

	/*
	 * Locks around here are not necessary - a port can't be
	 * opened after we removed the port struct from ports_list
	 * above.
	 */
	kref_put(&port->kref, remove_port);
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.