static int port_fops_release(struct inode *inode, struct file *filp)
{
	struct port *port;

	port = filp->private_data;

	/* Notify host of port being closed */
	send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0);

	spin_lock_irq(&port->inbuf_lock);
	port->guest_connected = false;

	discard_port_data(port);

	spin_unlock_irq(&port->inbuf_lock);

	spin_lock_irq(&port->outvq_lock);
	reclaim_consumed_buffers(port);
	spin_unlock_irq(&port->outvq_lock);

	reclaim_dma_bufs();
	/*
	 * Locks aren't necessary here as a port can't be opened after
	 * unplug, and if a port isn't unplugged, a kref would already
	 * exist for the port.  Plus, taking ports_lock here would
	 * create a dependency on other locks taken by functions
	 * inside remove_port if we're the last holder of the port,
	 * creating many problems.
	 */
	kref_put(&port->kref, remove_port);

	return 0;
}

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.