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

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Date:   Thu, 10 Oct 2019 14:07:23 +0000
From:   Fabien DESSENNE <fabien.dessenne@...com>
To:     Johan Hovold <johan@...nel.org>, Rob Clark <robdclark@...il.com>,
        "Sean Paul" <sean@...rly.run>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Harald Freudenberger" <freude@...ux.ibm.com>
CC:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        "Heiko Carstens" <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "freedreno@...ts.freedesktop.org" <freedreno@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable <stable@...r.kernel.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>
Subject: Re: [PATCH 2/4] media: bdisp: fix memleak on release

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@...r.kernel.org>     # 4.2
> Cc: Fabien Dessenne <fabien.dessenne@...com>
> Cc: Hans Verkuil <hans.verkuil@...co.com>
> Cc: Mauro Carvalho Chehab <mchehab@....samsung.com>
> Signed-off-by: Johan Hovold <johan@...nel.org>
Reviewed-by: Fabien Dessenne <fabien.dessenne@...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);
>