linux-kernel - Re: [PATCH 4/4] pinctrl: nomadik: Prevent NULL dereference if of_match

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Message-ID: <20121115151541.GC14476@gmail.com>
Date:	Thu, 15 Nov 2012 15:15:41 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Axel Lin <axel.lin@...ics.com>,
	Patrice Chotard <patrice.chotard@...ricsson.com>,
	Srinidhi Kasagar <srinidhi.kasagar@...ricsson.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/4] pinctrl: nomadik: Prevent NULL dereference if
 of_match_device returns NULL

On Thu, 15 Nov 2012, Linus Walleij wrote:

> On Thu, Nov 15, 2012 at 5:56 AM, Axel Lin <axel.lin@...ics.com> wrote:
> 
> > of_match_device() may return NULL.
> >
> > Signed-off-by: Axel Lin <axel.lin@...ics.com>
> > ---
> >  drivers/pinctrl/pinctrl-nomadik.c |   11 ++++++++---
> >  1 file changed, 8 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/pinctrl/pinctrl-nomadik.c b/drivers/pinctrl/pinctrl-nomadik.c
> > index 238060e..40bd1b3 100644
> > --- a/drivers/pinctrl/pinctrl-nomadik.c
> > +++ b/drivers/pinctrl/pinctrl-nomadik.c
> > @@ -1863,9 +1863,14 @@ static int __devinit nmk_pinctrl_probe(struct platform_device *pdev)
> >
> >         if (platid)
> >                 version = platid->driver_data;
> > -       else if (np)
> > -               version = (unsigned int)
> > -                       of_match_device(nmk_pinctrl_match, &pdev->dev)->data;
> > +       else if (np) {
> > +               const struct of_device_id *match;
> > +
> > +               match = of_match_device(nmk_pinctrl_match, &pdev->dev);
> > +               if (!match)
> > +                       return -ENODEV;
> > +               version = (unsigned int) match->data;
> > +       }
> 
> AFAICT this can actually happen so patch applied, unless Lee
> speaks against it.

At the very least it make the code easy to read.

Acked-by: Lee Jones <lee.jones@...aro.org>

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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