linux-kernel - Re: [PATCH] media: fdp1: Fix a memory leak bug

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Date:   Wed, 21 Aug 2019 12:39:20 +0100
From:   Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        "open list:MEDIA DRIVERS FOR RENESAS - FDP1" 
        <linux-media@...r.kernel.org>,
        "open list:MEDIA DRIVERS FOR RENESAS - FDP1" 
        <linux-renesas-soc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: fdp1: Fix a memory leak bug

Hi Wenwen,

On 18/08/2019 06:58, Wenwen Wang wrote:
> In fdp1_open(), 'ctx' is allocated through kzalloc(). However, it is not
> deallocated if v4l2_ctrl_new_std() fails, leading to a memory leak bug. To
> fix this issue, free 'ctx' before going to the 'done' label.
We could also free it up in the error path, with an if (ret) kfree(ctx);
and remove the kfree which is in the "if (IS_ERR(ctx->fh.m2m_ctx))" check.

But I think that doesn't gain much really. So this is ok by me... If you
prefer that method, then feel free to submit a v2,

Otherwise I think this is fine:

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>

> Signed-off-by: Wenwen Wang <wenwen@...uga.edu>

> ---
>  drivers/media/platform/rcar_fdp1.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/media/platform/rcar_fdp1.c b/drivers/media/platform/rcar_fdp1.c
> index 43aae9b..9e4b330 100644
> --- a/drivers/media/platform/rcar_fdp1.c
> +++ b/drivers/media/platform/rcar_fdp1.c
> @@ -2122,6 +2122,7 @@ static int fdp1_open(struct file *file)
>  	if (ctx->hdl.error) {
>  		ret = ctx->hdl.error;
>  		v4l2_ctrl_handler_free(&ctx->hdl);
> +		kfree(ctx);
>  		goto done;
>  	}
>  
>