linux-kernel - Re: [PATCH 2/4] sound/soc/ep93xx/ep93xx-i2s.c: add missing kfree

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Date:	Sat, 20 Aug 2011 09:31:55 +0200
From:	Alexander Sverdlin <subaparts@...dex.ru>
To:	Julia Lawall <julia@...u.dk>
Cc:	Liam Girdwood <lrg@...com>, kernel-janitors@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Ryan Mallon <rmallon@...il.com>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] sound/soc/ep93xx/ep93xx-i2s.c: add missing kfree

Hello!

I believe, fix is correct.
Acked-by: Alexander Sverdlin <subaparts@...dex.ru>

On Sat, 2011-08-20 at 08:12 +0200, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> Introduce a new label that includes kfree and jump to that one.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> identifier x;
> expression E1!=0,E2,E3,E4;
> statement S;
> iterator I;
> @@
> 
> (
> if (...) { ... when != kfree(x)
>                when != x = E3
>                when != E3 = x
> *  return ...;
>  }
> ... when != x = E2
>     when != I(...,x,...) S
> if (...) { ... when != x = E4
>  kfree(x); ... return ...; }
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  sound/soc/ep93xx/ep93xx-i2s.c |    5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/soc/ep93xx/ep93xx-i2s.c b/sound/soc/ep93xx/ep93xx-i2s.c
> index 56efa0c..099614e 100644
> --- a/sound/soc/ep93xx/ep93xx-i2s.c
> +++ b/sound/soc/ep93xx/ep93xx-i2s.c
> @@ -385,14 +385,14 @@ static int ep93xx_i2s_probe(struct platform_device *pdev)
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	if (!res) {
>  		err = -ENODEV;
> -		goto fail;
> +		goto fail_free_info;
>  	}
>  
>  	info->mem = request_mem_region(res->start, resource_size(res),
>  				       pdev->name);
>  	if (!info->mem) {
>  		err = -EBUSY;
> -		goto fail;
> +		goto fail_free_info;
>  	}
>  
>  	info->regs = ioremap(info->mem->start, resource_size(info->mem));
> @@ -435,6 +435,7 @@ fail_unmap_mem:
>  	iounmap(info->regs);
>  fail_release_mem:
>  	release_mem_region(info->mem->start, resource_size(info->mem));
> +fail_free_info:
>  	kfree(info);
>  fail:
>  	return err;
> 
> 


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