linux-kernel - Re: [PATCH 5/6] drivers/media/media-device: add "release" callback

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Date:	Thu, 9 Jun 2016 08:56:34 -0300
From:	Mauro Carvalho Chehab <mchehab@....samsung.com>
To:	Max Kellermann <max@...mpel.org>
Cc:	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH 5/6] drivers/media/media-device: add "release" callback

Em Mon, 21 Mar 2016 14:30:38 +0100
Max Kellermann <max@...mpel.org> escreveu:

> Allow the client to free its data structures only after all files have
> been closed (fixing use-after-free bugs).

Hmm... Shuah is also working on fixing such issues at the media controller
stuff, and I made a few fix patches myself.

Our work is at:
	https://git.linuxtv.org/mchehab/experimental.git/log/?h=media_cdev_fix

Please base your changes on it, to avoid conflicting work or rework.

I just rebased it on the top of media_tree (plus the patches for it
that I didn't push yet).


Thanks!
Mauro


> 
> Signed-off-by: Max Kellermann <max@...mpel.org>
> ---
>  drivers/media/media-device.c |    9 +++++++--
>  include/media/media-device.h |    2 ++
>  2 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
> index 5c4669c..a3901f9 100644
> --- a/drivers/media/media-device.c
> +++ b/drivers/media/media-device.c
> @@ -551,9 +551,14 @@ static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
>   * Registration/unregistration
>   */
>  
> -static void media_device_release(struct media_devnode *mdev)
> +static void media_device_release(struct media_devnode *devnode)
>  {
> -	dev_dbg(mdev->parent, "Media device released\n");
> +	struct media_device *mdev = to_media_device(devnode);
> +
> +	dev_dbg(devnode->parent, "Media device released\n");
> +
> +	if (mdev->release)
> +		mdev->release(mdev);
>  }
>  
>  /**
> diff --git a/include/media/media-device.h b/include/media/media-device.h
> index d385589..d184d0c 100644
> --- a/include/media/media-device.h
> +++ b/include/media/media-device.h
> @@ -326,6 +326,8 @@ struct media_device {
>  
>  	int (*link_notify)(struct media_link *link, u32 flags,
>  			   unsigned int notification);
> +
> +	void (*release)(struct media_device *mdev);
>  };
>  
>  #ifdef CONFIG_MEDIA_CONTROLLER
> 
> --
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-- 
Thanks,
Mauro