linux-kernel - Re: [PATCH 2/2] media: omap3isp change to devm for resources

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Date:   Fri, 16 Dec 2016 01:06:10 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Shuah Khan <shuahkh@....samsung.com>
Cc:     sakari.ailus@...ux.intel.com, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] media: omap3isp change to devm for resources

Hi Shuah,

On Thursday 15 Dec 2016 15:51:41 Shuah Khan wrote:
> On 12/15/2016 03:33 PM, Laurent Pinchart wrote:
> > Hi Shuah,
> > 
> > Thank you for the patch.
> > 
> > Sakari has submitted a similar patch as part of his kref series. Please
> > use it as a base point and rework it if you want to get it merged
> > separately. I've reviewed the patch and left quite a few comments that
> > need to be addressed.
>
> I really don't mind if Sakari uses this patch as is and makes the changes
> you requested and submits devm removal as an independent patch.
> 
> My intent behind sending this one is to help him out since I already did
> this patch that is on top of 4.9-rc8 without any dependencies on Sakari's
> RFC patch.

I've only seen your reply to Sakari's patch after replying to this one. Thank 
you for providing your version, I'll let Sakari merge both and resubmit.

> > On Thursday 15 Dec 2016 12:40:08 Shuah Khan wrote:
> >> Using devm resources that have external dependencies such as a dev
> >> for a file handler could result in devm resources getting released
> >> durin unbind while an application has the file open holding pointer
> >> to the devm resource. This results in use-after-free errors when the
> >> application exits.
> >> 
> >> Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
> >> ---
> >> 
> >>  drivers/media/platform/omap3isp/isp.c         | 71 +++++++++++++--------
> >>  drivers/media/platform/omap3isp/ispccp2.c     | 10 +++-
> >>  drivers/media/platform/omap3isp/isph3a_aewb.c | 21 +++++---
> >>  drivers/media/platform/omap3isp/isph3a_af.c   | 21 +++++---
> >>  drivers/media/platform/omap3isp/isphist.c     |  5 +-
> >>  5 files changed, 92 insertions(+), 36 deletions(-)

-- 
Regards,

Laurent Pinchart