linux-kernel - Re: [PATCH] media: aspeed-video: Fix memory leaks in aspeed_video

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Date:   Mon, 28 Oct 2019 09:27:30 -0700
From:   Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
To:     Navid Emamdoost <navid.emamdoost@...il.com>
Cc:     linux-aspeed@...ts.ozlabs.org, Andrew Jeffery <andrew@...id.au>,
        kjlu@....edu, openbmc@...ts.ozlabs.org,
        Eddie James <eajames@...ux.ibm.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        emamd001@....edu, smccaman@....edu,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] media: aspeed-video: Fix memory leaks in
 aspeed_video_probe

Hi Navid,

On 10/25/2019 9:25 PM, Navid Emamdoost wrote:
> In the implementation of aspeed_video_probe() the allocated memory for
> video should be released in case of failure. Release video if either
> devm_ioremap_resource() or aspeed_video_init() or
> aspeed_video_setup_video() fails.
> 
> Fixes: d2b4387f3bdf ("media: platform: Add Aspeed Video Engine driver")
> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
>   drivers/media/platform/aspeed-video.c | 14 ++++++++++----
>   1 file changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
> index eb12f3793062..8c473356132d 100644
> --- a/drivers/media/platform/aspeed-video.c
> +++ b/drivers/media/platform/aspeed-video.c
> @@ -1663,18 +1663,24 @@ static int aspeed_video_probe(struct platform_device *pdev)
>   
>   	video->base = devm_ioremap_resource(video->dev, res);
>   
> -	if (IS_ERR(video->base))
> -		return PTR_ERR(video->base);
> +	if (IS_ERR(video->base)) {
> +		rc = PTR_ERR(video->base);
> +		goto free_video;
> +	}
>   
>   	rc = aspeed_video_init(video);
>   	if (rc)
> -		return rc;
> +		goto free_video;
>   
>   	rc = aspeed_video_setup_video(video);
>   	if (rc)
> -		return rc;
> +		goto free_video;
>   
>   	return 0;
> +
> +free_video:
> +	kfree(video);
> +	return rc;
>   }
>   
>   static int aspeed_video_remove(struct platform_device *pdev)
> 

Can we simply change kzalloc in aspeed_video_probe with devm_kzalloc
so that we don't need to take care of freeing of video? I think it would
be more simpler.

Cheers,

Jae