linux-kernel - Re: [PATCH 4.19 047/125] media: davinci: vpif

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Date:   Wed, 2 Sep 2020 09:39:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Pavel Machek <pavel@...x.de>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Evgeny Novikov <novikov@...ras.ru>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 047/125] media: davinci: vpif_capture: fix potential
 double free

On Tue, Sep 01, 2020 at 08:42:58PM +0200, Pavel Machek wrote:
> Hi!
> 
> > [ Upstream commit 602649eadaa0c977e362e641f51ec306bc1d365d ]
> > 
> > In case of errors vpif_probe_complete() releases memory for vpif_obj.sd
> > and unregisters the V4L2 device. But then this is done again by
> > vpif_probe() itself. The patch removes the cleaning from
> > vpif_probe_complete().
> 
> > Signed-off-by: Evgeny Novikov <novikov@...ras.ru>
> > Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> > Signed-off-by: Sasha Levin <sashal@...nel.org>
> > ---
> >  drivers/media/platform/davinci/vpif_capture.c | 2 --
> >  1 file changed, 2 deletions(-)
> > 
> > diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
> > index a96f53ce80886..cf1d11e6dd8c4 100644
> > --- a/drivers/media/platform/davinci/vpif_capture.c
> > +++ b/drivers/media/platform/davinci/vpif_capture.c
> > @@ -1489,8 +1489,6 @@ probe_out:
> >  		/* Unregister video device */
> >  		video_unregister_device(&ch->video_dev);
> >  	}
> > -	kfree(vpif_obj.sd);
> > -	v4l2_device_unregister(&vpif_obj.v4l2_dev);
> >  
> >  	return err;
> >  }
> 
> This one is wrong. Unlike mainline, 4.19 does check return value of
> vpif_probe_complete(), and thus it will lead to memory leak in 4.19.

Thanks, now dropped.

greg k-h