[PATCH] hvc_console: Fix a race between hvc_close and hvc_remove

[Alan Cox]

> +	tty_kref_get(hp->tty);
>  	spin_lock_irqsave(&hp->lock, flags);
>  	tty = hp->tty;
>  
> @@ -830,7 +833,9 @@ int hvc_remove(struct hvc_struct *hp)
>  	 * cleaned up the hvc_struct.
>  	 */
>  	if (tty)
> -		tty_hangup(tty);
> +		tty_vhangup(tty);
> +
> +	tty_kref_put(hp->tty);

You need to deref hp->tty, take the kref under the lock (and indeed do
all assignments to it that way too), then tty_kref_put(tty), otherwise
what stops hp->tty changing during the remove ?

Take a look how tty_port_tty_get() and tty_port.c does it ...

Alan