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

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Message-ID: <CAHp75VdfzUhK1dOjxkkj_0ZCZyWFPRwvyE8CGgsUfdgj6Afe4w@mail.gmail.com>
Date:	Mon, 9 Nov 2015 16:16:16 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	LABBE Corentin <clabbe.montjoie@...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 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.

-- 
With Best Regards,
Andy Shevchenko
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