Re: [PATCH 2/4] media: bdisp: fix memleak on release

Fabien DESSENNE
2019-10-10T14:15:11Z

Hi Johan

Thank you for the patch

BR

Fabien

On 10/10/2019 3:13 PM, Johan Hovold wrote:
> If a process is interrupted while accessing the video device and the
> device lock is contended, release() could return early and fail to free
> related resources.
>
> Note that the return value of the v4l2 release file operation is
> ignored.
>
> Fixes: 28ffeebbb7bd ("[media] bdisp: 2D blitter driver using v4l2 mem2mem framework")
> Cc: stable <stable@vger.kernel.org> # 4.2
> Cc: Fabien Dessenne <fabien.dessenne@st.com>
> Cc: Hans Verkuil <hans.verkuil@cisco.com>
> Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
> Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Fabien Dessenne <fabien.dessenne@st.com>
> ---
> drivers/media/platform/sti/bdisp/bdisp-v4l2.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/media/platform/sti/bdisp/bdisp-v4l2.c b/drivers/media/platform/sti/bdisp/bdisp-v4l2.c
> index e90f1ba30574..675b5f2b4c2e 100644
> --- a/drivers/media/platform/sti/bdisp/bdisp-v4l2.c
> +++ b/drivers/media/platform/sti/bdisp/bdisp-v4l2.c
> @@ -651,8 +651,7 @@ static int bdisp_release(struct file *file)
>
> dev_dbg(bdisp->dev, "%s\n", __func__);
>
> - if (mutex_lock_interruptible(&bdisp->lock))
> - return -ERESTARTSYS;
> + mutex_lock(&bdisp->lock);
>
> v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
>