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

[Gustavo A. R. Silva]

Hi Martin,

Quoting Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>:

> On Fri, Jul 7, 2017 at 8:46 AM, Gustavo A. R. Silva
> <garsilva@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx>
> 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:

I get it, glad to help. :)

> Acked-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
>
>
> > ---
> >  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