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

From	Andy Shevchenko <andy.shevchenko@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] gpio: 74xx: fix a possible NULL dereference
Date	2015-11-09 15:20 +0100
Message-ID	<qsVsC-7v9-9@gated-at.bofh.it> (permalink)
References	<qrv7d-9F-31@gated-at.bofh.it> <qsIvo-7n4-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Mon, Nov 9, 2015 at 2:21 AM, Alexandre Courbot <gnurou@gmail.com> wrote:
> On Fri, Nov 6, 2015 at 12:55 AM, LABBE Corentin
> <clabbe.montjoie@gmail.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@gmail.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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Thread

[PATCH] gpio: 74xx: fix a possible NULL dereference LABBE Corentin <clabbe.montjoie@gmail.com> - 2015-11-05 17:00 +0100
  Re: [PATCH] gpio: 74xx: fix a possible NULL dereference Alexandre Courbot <gnurou@gmail.com> - 2015-11-09 01:30 +0100
    Re: [PATCH] gpio: 74xx: fix a possible NULL dereference Andy Shevchenko <andy.shevchenko@gmail.com> - 2015-11-09 15:20 +0100
      Re: [PATCH] gpio: 74xx: fix a possible NULL dereference LABBE Corentin <clabbe.montjoie@gmail.com> - 2015-11-10 08:20 +0100

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