linux-kernel - Re: [PATCH] gpio: 74xx: fix a possible NULL dereference

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Date:	Tue, 10 Nov 2015 08:16:11 +0100
From:	LABBE Corentin <clabbe.montjoie@...il.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: 74xx: fix a possible NULL dereference

On Mon, Nov 09, 2015 at 04:16:16PM +0200, Andy Shevchenko wrote:
> On Mon, Nov 9, 2015 at 2:21 AM, Alexandre Courbot <gnurou@...il.com> wrote:
> > On Fri, Nov 6, 2015 at 12:55 AM, LABBE Corentin
> > <clabbe.montjoie@...il.com> wrote:
> >> of_match_device could return NULL, and so cause a NULL pointer
> >> dereference later at line 132:
> >> priv->flags = (uintptr_t) of_id->data;
> >>
> >> Reported-by: coverity (CID 1324141)
> >> Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
> >> ---
> >>  drivers/gpio/gpio-74xx-mmio.c | 3 +++
> >>  1 file changed, 3 insertions(+)
> >>
> >> diff --git a/drivers/gpio/gpio-74xx-mmio.c b/drivers/gpio/gpio-74xx-mmio.c
> >> index 6ed7c0f..4a7be0f 100644
> >> --- a/drivers/gpio/gpio-74xx-mmio.c
> >> +++ b/drivers/gpio/gpio-74xx-mmio.c
> >> @@ -120,6 +120,9 @@ static int mmio_74xx_gpio_probe(struct platform_device *pdev)
> >>         void __iomem *dat;
> >>         int err;
> >>
> >> +       if (!of_id)
> >> +               return -ENODEV;
> >> +
> >
> > Nit: in that case, could you also move the assignment of of_id to its
> > own line right above these added lines? It would keep things in the
> > same place
> 
> I think it's more that just a nit. +1 to move assignment.

Hello

I agree, I will send an updated patch soon.

Regards

LABBE Corentin
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