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

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Date:   Wed, 4 Oct 2023 12:08:59 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.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

* Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com> [231004 09:05]:
> 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?

Hmm yeah we should just have them all check for co->index < 0.

Regards,

Tony