[PATCH] iio: adc: meson-saradc: add NULL check on of_match_device() return value

[garsilva@embeddedor.com (Gustavo A. R. Silva)]

On 07/09/2017 01:08 PM, Jonathan Cameron wrote:
> On Sat, 8 Jul 2017 15:42:46 +0200
> Martin Blumenstingl <martin.blumenstingl@googlemail.com> wrote:
>
>> On Fri, Jul 7, 2017 at 8:46 AM, Gustavo A. R. Silva
>> <garsilva@embeddedor.com> wrote:
>>> Check return value from call to of_match_device()
>>> in order to prevent a NULL pointer dereference.
>>>
>>> In case of NULL print error message and return -ENODEV
>>>
>>> Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
>> thanks for finding this. a crash here is a rather theoretical problem
>> (since all compatible strings have their corresponding match data) -
>> but it doesn't hurt either, so:
>>
>> Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> Applied.
>

Thank you, Jonathan.

> Jonathan
>>
>>
>>> ---
>>>  drivers/iio/adc/meson_saradc.c | 5 +++++
>>>  1 file changed, 5 insertions(+)
>>>
>>> diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
>>> index 83da50e..07dbcc3 100644
>>> --- a/drivers/iio/adc/meson_saradc.c
>>> +++ b/drivers/iio/adc/meson_saradc.c
>>> @@ -915,6 +915,11 @@ static int meson_sar_adc_probe(struct platform_device *pdev)
>>>         init_completion(&priv->done);
>>>
>>>         match = of_match_device(meson_sar_adc_of_match, &pdev->dev);
>>> +       if (!match) {
>>> +               dev_err(&pdev->dev, "failed to match device\n");
>>> +               return -ENODEV;
>>> +       }
>>> +
>>>         priv->data = match->data;
>>>
>>>         indio_dev->name = priv->data->name;
>>> --
>>> 2.5.0
>>>
>>>
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>

-- 
Gustavo A. R. Silva