linux-kernel - Re: [PATCH v2] iio: imu: adis16400: release allocated memory on failure

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Message-ID: <d4c21c74d88e542771818720e6270e4d6141b686.camel@analog.com>
Date:   Fri, 20 Sep 2019 06:46:37 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "navid.emamdoost@...il.com" <navid.emamdoost@...il.com>
CC:     "Popa, Stefan Serban" <StefanSerban.Popa@...log.com>,
        "emamd001@....edu" <emamd001@....edu>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jic23@...nel.org" <jic23@...nel.org>,
        "knaack.h@....de" <knaack.h@....de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "smccaman@....edu" <smccaman@....edu>,
        "kjlu@....edu" <kjlu@....edu>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>
Subject: Re: [PATCH v2] iio: imu: adis16400: release allocated memory on
 failure

On Thu, 2019-09-19 at 10:50 -0500, Navid Emamdoost wrote:
> In adis_update_scan_mode, if allocation for adis->buffer fails,
> previously allocated adis->xfer needs to be released.
> 
> v2: added adis->xfer = NULL to avoid any potential double free.

Reviewed-by: Alexandru Ardelean <alexandru.ardelean@...log.com>

> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
>  drivers/iio/imu/adis_buffer.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/imu/adis_buffer.c
> b/drivers/iio/imu/adis_buffer.c
> index 9ac8356d9a95..f446ff497809 100644
> --- a/drivers/iio/imu/adis_buffer.c
> +++ b/drivers/iio/imu/adis_buffer.c
> @@ -78,8 +78,11 @@ int adis_update_scan_mode(struct iio_dev *indio_dev,
>  		return -ENOMEM;
>  
>  	adis->buffer = kcalloc(indio_dev->scan_bytes, 2, GFP_KERNEL);
> -	if (!adis->buffer)
> +	if (!adis->buffer) {
> +		kfree(adis->xfer);
> +		adis->xfer = NULL;
>  		return -ENOMEM;
> +	}
>  
>  	rx = adis->buffer;
>  	tx = rx + scan_count;