linux-kernel - Re: [PATCH] media: vsp1: fix memory leak of dl on error return path

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Message-ID: <e5c3dede-2c59-4c64-7a8c-f022ee06cbfa@ideasonboard.com>
Date:   Mon, 29 Jul 2019 13:11:30 +0100
From:   Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
To:     Colin King <colin.king@...onical.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: vsp1: fix memory leak of dl on error return path

Hi Colin,

On 28/07/2019 18:11, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently when the call vsp1_dl_body_get fails and returns null the
> error return path leaks the allocation of dl. Fix this by kfree'ing
> dl before returning.

Eeep. This does indeed look to be the case.

> 
> Addresses-Coverity: ("Resource leak")
> Fixes: 5d7936b8e27d ("media: vsp1: Convert display lists to use new body pool")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Thank you!

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


> ---
>  drivers/media/platform/vsp1/vsp1_dl.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/vsp1/vsp1_dl.c b/drivers/media/platform/vsp1/vsp1_dl.c
> index 104b6f514536..d7b43037e500 100644
> --- a/drivers/media/platform/vsp1/vsp1_dl.c
> +++ b/drivers/media/platform/vsp1/vsp1_dl.c
> @@ -557,8 +557,10 @@ static struct vsp1_dl_list *vsp1_dl_list_alloc(struct vsp1_dl_manager *dlm)
>  
>  	/* Get a default body for our list. */
>  	dl->body0 = vsp1_dl_body_get(dlm->pool);
> -	if (!dl->body0)
> +	if (!dl->body0) {
> +		kfree(dl);
>  		return NULL;
> +	}
>  
>  	header_offset = dl->body0->max_entries * sizeof(*dl->body0->entries);
>  
>