linux-kernel - Re: [PATCH v4 3/8] iio: core: NULLify private pointer when there is no private data

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Date: Wed, 28 Feb 2024 23:36:43 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: David Lechner <dlechner@...libre.com>
Cc: Vinod Koul <vkoul@...nel.org>, Linus Walleij <linus.walleij@...aro.org>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Mark Brown <broonie@...nel.org>, Kees Cook <keescook@...omium.org>,
	linux-arm-kernel@...ts.infradead.org, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	linux-spi@...r.kernel.org, netdev@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: Re: [PATCH v4 3/8] iio: core: NULLify private pointer when there is
 no private data

On Wed, Feb 28, 2024 at 03:06:42PM -0600, David Lechner wrote:
> On Wed, Feb 28, 2024 at 2:50 PM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:

..

> > -       indio_dev->priv = (char *)iio_dev_opaque +
> > -               ALIGN(sizeof(struct iio_dev_opaque), IIO_DMA_MINALIGN);
> > +
> > +       if (sizeof_priv)
> > +               indio_dev->priv = (char *)iio_dev_opaque +
> > +                       ALIGN(sizeof(struct iio_dev_opaque), IIO_DMA_MINALIGN);
> > +       else
> > +               indio_dev->priv = NULL;
> 
> Do we actually need the else branch here since we use kzalloc() and
> therefore indio_dev->priv should already be NULL?

This is more robust, but I'm okay to drop this. Up to Jonathan.

-- 
With Best Regards,
Andy Shevchenko