linux-kernel - Re: [PATCH] serial: 8250: Check for valid console index

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Message-ID: <1fc2dc1d-33f2-6d65-6bdb-d4c7421cbc57@linux.intel.com>
Date:   Wed, 4 Oct 2023 12:05:35 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Tony Lindgren <tony@...mide.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Dhruva Gole <d-gole@...com>,
        John Ogness <john.ogness@...utronix.de>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-serial <linux-serial@...r.kernel.org>
Subject: Re: [PATCH] serial: 8250: Check for valid console index

On Wed, 4 Oct 2023, Tony Lindgren wrote:

> Let's not allow negative numbers for console index.
> 
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
>  drivers/tty/serial/8250/8250_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
> --- a/drivers/tty/serial/8250/8250_core.c
> +++ b/drivers/tty/serial/8250/8250_core.c
> @@ -611,7 +611,7 @@ static int univ8250_console_setup(struct console *co, char *options)
>  	 * if so, search for the first available port that does have
>  	 * console support.
>  	 */
> -	if (co->index >= UART_NR)
> +	if (co->index < 0 || co->index >= UART_NR)
>  		co->index = 0;

The inconsistencies how different serial drivers handle this situation 
seem staggering. Perhaps there should be some effort to make the behavior
uniform across them?

-- 
 i.