linux-kernel - Re: [PATCH][next] media: uvcvideo: Fix memory leak of object map on error exit path

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Message-ID: <YWBOUP98s0K3yVbc@pendragon.ideasonboard.com>
Date:   Fri, 8 Oct 2021 16:57:36 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Ricardo Ribalda <ribalda@...omium.org>,
        linux-media@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] media: uvcvideo: Fix memory leak of object map on
 error exit path

Hi Colin,

Thank you for the patch.

On Fri, Sep 17, 2021 at 12:49:30PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently when the allocation of map->name fails the error exit path
> does not kfree the previously allocated object map. Fix this by
> setting ret to -ENOMEM and taking the free_map exit error path to
> ensure map is kfree'd.
> 
> Addresses-Coverity: ("Resource leak")
> Fixes: 07adedb5c606 ("media: uvcvideo: Use control names from framework")

That's not the right commit ID, it should be 70fa906d6fce.

> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Mauro, could you add this in your tree for v5.16 ?

> ---
>  drivers/media/usb/uvc/uvc_v4l2.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index f4e4aff8ddf7..711556d13d03 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -44,8 +44,10 @@ static int uvc_ioctl_ctrl_map(struct uvc_video_chain *chain,
>  	if (v4l2_ctrl_get_name(map->id) == NULL) {
>  		map->name = kmemdup(xmap->name, sizeof(xmap->name),
>  				    GFP_KERNEL);
> -		if (!map->name)
> -			return -ENOMEM;
> +		if (!map->name) {
> +			ret = -ENOMEM;
> +			goto free_map;
> +		}
>  	}
>  	memcpy(map->entity, xmap->entity, sizeof(map->entity));
>  	map->selector = xmap->selector;

-- 
Regards,

Laurent Pinchart