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

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

[Colin King]

From: Colin Ian King <colin.king@canonical.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")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 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;
-- 
2.32.0

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

[Ricardo Ribalda]

Hi Collin

Thanks for catching it up.

On Fri, 17 Sept 2021 at 13:49, Colin King <colin.king@canonical.com> wrote:
>
> From: Colin Ian King <colin.king@canonical.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")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>

> ---
>  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;
> --
> 2.32.0
>


--
Ricardo Ribalda

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

[Laurent Pinchart]

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@canonical.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@canonical.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.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