linux-kernel - Re: [PATCH] [media] soc-camera: Remove bogus devm_kfree() in soc_of

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Date:	Wed, 18 Feb 2015 20:58:51 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Geert Uytterhoeven <geert+renesas@...der.be>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>
CC:	linux-media@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] [media] soc-camera: Remove bogus devm_kfree() in soc_of_bind()

Hello.

On 02/18/2015 07:32 PM, Geert Uytterhoeven wrote:

> Unlike scan_async_group(), soc_of_bind() doesn't allocate its
> soc_camera_async_client structure using devm_kzalloc(), but has it
> embedded inside the soc_of_info structure.  Hence on failure, it must
> not free it using devm_kfree(), as this will cause a warning, and may
> cause slab corruption:

[...]

> Fixes: 1ddc6a6caa94e1e1 ("[media] soc_camera: add support for dt binding soc_camera drivers")
> Cc: stable@...r.kernel.org
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> Triggered with shmobile-defconfig on r8a7791/koelsch.
> ---
>   drivers/media/platform/soc_camera/soc_camera.c | 1 -
>   1 file changed, 1 deletion(-)

> diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
> index cee7b56f84049944..d8a072fe46035821 100644
> --- a/drivers/media/platform/soc_camera/soc_camera.c
> +++ b/drivers/media/platform/soc_camera/soc_camera.c
> @@ -1665,7 +1665,6 @@ eclkreg:
>   eaddpdev:
>   	platform_device_put(sasc->pdev);
>   eallocpdev:
> -	devm_kfree(ici->v4l2_dev.dev, sasc);

    Perhaps Ben meant 'info' ISO 'sasc'? This way it would make more sense.

>   	dev_err(ici->v4l2_dev.dev, "group probe failed: %d\n", ret);
>
>   	return ret;

WBR, Sergei

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