linux-kernel - Re: [PATCH] staging: iio: ad9832: allocate data before using

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Message-ID: <20161109065125.GB2158@Socrates-DK>
Date:   Wed, 9 Nov 2016 14:51:27 +0800
From:   Eva Rachel Retuya <eraretuya@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: iio: ad9832: allocate data before using

On Tue, Nov 08, 2016 at 03:00:49PM +0100, Arnd Bergmann wrote:
> The regulator changes assigned data to an uninitialized pointer:
> 
> drivers/staging/iio/frequency/ad9832.c: In function 'ad9832_probe':
> drivers/staging/iio/frequency/ad9832.c:214:11: error: 'st' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> This moves the allocation of the 'st' structure before its first
> use, as it should have been.
> 
> Fixes: 43a07e48af44 ("staging: iio: ad9832: clean-up regulator 'reg'")
> Fixes: a98461d79ba5 ("staging: iio: ad9832: add DVDD regulator")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thank you, I completely missed this. Will be more careful next time.

Eva

> ---
>  drivers/staging/iio/frequency/ad9832.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c
> index 639047fade30..a5b2f068168d 100644
> --- a/drivers/staging/iio/frequency/ad9832.c
> +++ b/drivers/staging/iio/frequency/ad9832.c
> @@ -211,6 +211,13 @@ static int ad9832_probe(struct spi_device *spi)
>  		return -ENODEV;
>  	}
>  
> +	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	spi_set_drvdata(spi, indio_dev);
> +	st = iio_priv(indio_dev);
> +
>  	st->avdd = devm_regulator_get(&spi->dev, "avdd");
>  	if (IS_ERR(st->avdd))
>  		return PTR_ERR(st->avdd);
> @@ -233,13 +240,6 @@ static int ad9832_probe(struct spi_device *spi)
>  		goto error_disable_avdd;
>  	}
>  
> -	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
> -	if (!indio_dev) {
> -		ret = -ENOMEM;
> -		goto error_disable_dvdd;
> -	}
> -	spi_set_drvdata(spi, indio_dev);
> -	st = iio_priv(indio_dev);
>  	st->mclk = pdata->mclk;
>  	st->spi = spi;
>  
> -- 
> 2.9.0
>