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

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Message-ID: <375d54d0-f874-92d5-91c5-c7ff2b33daff@linux.intel.com>
Date:   Wed, 4 Oct 2023 12:13:21 +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:

> * 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.

Right but it's only about that, some return -Exx codes (more than one -Exx 
variant) and some do assign just 0 like here.

-- 
 i.