linux-kernel - Re: [PATCH] staging: iio: ad9832:

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Date:   Sat, 19 Nov 2016 11:24:40 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        lars@...afoo.de, Michael.Hennerich@...log.com, knaack.h@....de,
        pmeerw@...erw.net, gregkh@...uxfoundation.org, eraretuya@...il.com
Cc:     linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] staging: iio: ad9832:

On 19/11/16 11:08, Christophe JAILLET wrote:
> Commit a98461d79ba5 ("staging: iio: ad9832: add DVDD regulator") and
> commit 43a07e48af44 ("staging: iio: ad9832: clean-up regulator 'reg'") add
> some dereference of 'st' which is an un-initialized pointer at this point.
> 
> Re-order code and tweak error handling in order to allocate memory and have
> 'st' be a valid pointer before using it.
> 
> Fixes: a98461d79ba5 ("staging: iio: ad9832: add DVDD regulator")
> Fixes: 43a07e48af44 ("staging: iio: ad9832: clean-up regulator 'reg'")
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Thanks but fixed already.
6826fdbd2 "staging: iio: ad9832: allocate data before using
Arnd Bergmann

Jonathan  
> ---
> Compile tested only
> ---
>  drivers/staging/iio/frequency/ad9832.c | 19 +++++++++----------
>  1 file changed, 9 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c
> index 639047fade30..16894836f982 100644
> --- a/drivers/staging/iio/frequency/ad9832.c
> +++ b/drivers/staging/iio/frequency/ad9832.c
> @@ -211,6 +211,15 @@ 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->mclk = pdata->mclk;
> +	st->spi = spi;
> +
>  	st->avdd = devm_regulator_get(&spi->dev, "avdd");
>  	if (IS_ERR(st->avdd))
>  		return PTR_ERR(st->avdd);
> @@ -233,16 +242,6 @@ 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;
> -
>  	indio_dev->dev.parent = &spi->dev;
>  	indio_dev->name = spi_get_device_id(spi)->name;
>  	indio_dev->info = &ad9832_info;
>