linux-kernel - Re: [PATCH v3] ARM: imx: fix error handling in ipu device registration

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Date:	Sun, 18 May 2014 00:22:10 +0200
From:	Emil Goode <emilgoode@...il.com>
To:	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:	Shawn Guo <shawn.guo@...escale.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v3] ARM: imx: fix error handling in ipu device
 registration

Hello Uwe,

I was to quick to resend the patch, sorry.

On Sat, May 17, 2014 at 09:18:21PM +0200, Uwe Kleine-König wrote:
> Hello Emil,
> 
> On Sat, May 17, 2014 at 08:40:33PM +0200, Emil Goode wrote:
> > If we fail to allocate struct platform_device pdev we
> > dereference it after the goto label err.
> > 
> > I have rearranged the error handling a bit to fix the issue
> > and also make it more clear.
> > 
> > Signed-off-by: Emil Goode <emilgoode@...il.com>
> > ---
> > v3: Made subject line more specific.
> > v2: Changed to return -ENOMEM instead of ret where possible and
> >     updated the subject line.
> > 
> >  arch/arm/mach-imx/devices/platform-ipu-core.c |   22 +++++++++++++---------
> >  1 file changed, 13 insertions(+), 9 deletions(-)
> Considering that you can fix the issue also by just doing:
> 
> diff --git a/arch/arm/mach-imx/devices/platform-ipu-core.c b/arch/arm/mach-imx/devices/platform-ipu-core.c
> index fc4dd7cedc11..6bd7c3f37ac0 100644
> --- a/arch/arm/mach-imx/devices/platform-ipu-core.c
> +++ b/arch/arm/mach-imx/devices/platform-ipu-core.c
> @@ -77,7 +77,7 @@ struct platform_device *__init imx_alloc_mx3_camera(
>  
>  	pdev = platform_device_alloc("mx3-camera", 0);
>  	if (!pdev)
> -		goto err;
> +		return ERR_PTR(-ENOMEM);
>  
>  	pdev->dev.dma_mask = kmalloc(sizeof(*pdev->dev.dma_mask), GFP_KERNEL);
>  	if (!pdev->dev.dma_mask)
> 
> or
> 
> diff --git a/arch/arm/mach-imx/devices/platform-ipu-core.c b/arch/arm/mach-imx/devices/platform-ipu-core.c
> index fc4dd7cedc11..c609f3667200 100644
> --- a/arch/arm/mach-imx/devices/platform-ipu-core.c
> +++ b/arch/arm/mach-imx/devices/platform-ipu-core.c
> @@ -96,7 +96,8 @@ struct platform_device *__init imx_alloc_mx3_camera(
>  		ret = platform_device_add_data(pdev, pdata, sizeof(*pdata));
>  		if (ret) {
>  err:
> -			kfree(pdev->dev.dma_mask);
> +			if (pdev)
> +				kfree(pdev->dev.dma_mask);
>  			platform_device_put(pdev);
>  			return ERR_PTR(-ENODEV);
>  		}
> 
> I would prefer one of them as it is easier to justify and for the next
> cycle convert the function to platform_device_register_full.

Agreed, that makes sense considering the second patch that would convert to
platform_device_register_full().

> 
> Also you should point out in the commit log that the issue was found by
> coccinelle.

Ok, will do that.

Thank you!

Best regards,

Emil Goode
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