linux-kernel - Re: [PATCH v3 02/27] staging: iio: resolver: ad2s1210: fix use before initialization

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Message-ID: <20230930152831.432647d7@jic23-huawei>
Date:   Sat, 30 Sep 2023 15:28:31 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     David Lechner <dlechner@...libre.com>
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-staging@...ts.linux.dev,
        David Lechner <david@...hnology.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Axel Haslam <ahaslam@...libre.com>,
        Philip Molloy <pmolloy@...libre.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 02/27] staging: iio: resolver: ad2s1210: fix use
 before initialization

On Fri, 29 Sep 2023 12:23:07 -0500
David Lechner <dlechner@...libre.com> wrote:

> From: David Lechner <david@...hnology.com>
> 
> From: David Lechner <dlechner@...libre.com>
> 
> This fixes a use before initialization in ad2s1210_probe(). The
> ad2s1210_setup_gpios() function uses st->sdev but it was being called
> before this field was initialized.
> 
> Signed-off-by: David Lechner <dlechner@...libre.com>
Applied to the togreg banch of iio.git and pushed out as testing for 0-day to
poke at it.

I didn't pull this out as a fix to upstream quicker because it would
make a mess of the rest of applying the rest of the series.

Maybe we want to consider backporting some of these at somepoint.

Jonathan

> ---
> 
> v3 changes:
> * This is a new patch split out from "staging: iio: resolver: ad2s1210:
>  fix probe"
> 
>  drivers/staging/iio/resolver/ad2s1210.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c
> index f695ca0547e4..3f08b59f4e19 100644
> --- a/drivers/staging/iio/resolver/ad2s1210.c
> +++ b/drivers/staging/iio/resolver/ad2s1210.c
> @@ -658,9 +658,6 @@ static int ad2s1210_probe(struct spi_device *spi)
>  	if (!indio_dev)
>  		return -ENOMEM;
>  	st = iio_priv(indio_dev);
> -	ret = ad2s1210_setup_gpios(st);
> -	if (ret < 0)
> -		return ret;
>  
>  	spi_set_drvdata(spi, indio_dev);
>  
> @@ -671,6 +668,10 @@ static int ad2s1210_probe(struct spi_device *spi)
>  	st->resolution = 12;
>  	st->fexcit = AD2S1210_DEF_EXCIT;
>  
> +	ret = ad2s1210_setup_gpios(st);
> +	if (ret < 0)
> +		return ret;
> +
>  	indio_dev->info = &ad2s1210_info;
>  	indio_dev->modes = INDIO_DIRECT_MODE;
>  	indio_dev->channels = ad2s1210_channels;
>