Re: [PATCH v4 1/3] auxdisplay: Add 7-segment LED display driver

[Andy Shevchenko <andy@xxxxxxxxxx>]

On Tue, Mar 05, 2024 at 09:23:07AM +0100, Geert Uytterhoeven wrote:
> On Tue, Mar 5, 2024 at 4:59 AM Chris Packham
> <chris.packham@xxxxxxxxxxxxxxxxxxx> wrote:

...

> > +       priv->segment_gpios = devm_gpiod_get_array(dev, "segment", GPIOD_OUT_LOW);
> > +       if (IS_ERR(priv->segment_gpios))
> > +               return PTR_ERR(priv->segment_gpios);
> 
> This needs some validation of priv->segment_gpios->ndescs, else the
> call to gpiod_set_array_value_cansleep() in seg_led_update() may
> trigger an out-of-bounds access of the values bitmap.

Alternatively we can call gpiod_count() beforehand and check its result.

-- 
With Best Regards,
Andy Shevchenko