linux-kernel - Re: [PATCH 1/3] thinkpad_acpi: return -NODEV while operating uninitialized LEDs

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Date:	Fri, 7 Jun 2013 16:59:05 +0800
From:	Adam Lee <adam.lee@...onical.com>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
	ibm-acpi-devel@...ts.sourceforge.net,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
	Alex Hung <alex.hung@...onical.com>
Subject: Re: [PATCH 1/3] thinkpad_acpi: return -NODEV while operating
 uninitialized LEDs

On Fri, Jun 07, 2013 at 10:53:50AM +0200, Bjørn Mork wrote:
> Adam Lee <adam.lee@...onical.com> writes:
> 
> > --- a/drivers/platform/x86/thinkpad_acpi.c
> > +++ b/drivers/platform/x86/thinkpad_acpi.c
> > @@ -5401,9 +5401,12 @@ static int led_write(char *buf)
> >  		return -ENODEV;
> >  
> >  	while ((cmd = next_cmd(&buf))) {
> > -		if (sscanf(cmd, "%d", &led) != 1 || led < 0 || led > 15)
> > +		if (sscanf(cmd, "%d", &led) != 1)
> >  			return -EINVAL;
> >  
> > +		if (!tpacpi_leds[led].led)
> > +			return -ENODEV;
> 
> This looks risky.  Why did you remove the index sanity check?  What will
> happen now if the input is e.g "-1" or "42"?
> 
> BTW, the magic number 15 should probably be (TPACPI_LED_NUMLEDS - 1)
> instead.

Oh, good point! I was thinking led_init() already checked the index.

Will submit patch v2, thanks.

-- 
Regards,
Adam Lee
Hardware Enablement
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