linux-kernel - Re: [PATCH v2] sparc: kernel/sbus.c: fix memory leakage

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Date:	Thu, 17 Jan 2013 10:41:59 +0000
From:	Richard Mortimer <richm@...elvet.org.uk>
To:	Cong Ding <dinggnu@...il.com>
CC:	Sam Ravnborg <sam@...nborg.org>,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sparc: kernel/sbus.c: fix memory leakage



On 16/01/2013 22:01, Cong Ding wrote:
> the variable iommu and strbuf are not freed if it goes to error.
>
> Signed-off-by: Cong Ding <dinggnu@...il.com>
> ---
>   arch/sparc/kernel/sbus.c |    2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/arch/sparc/kernel/sbus.c b/arch/sparc/kernel/sbus.c
> index 1271b3a..78aa26b 100644
> --- a/arch/sparc/kernel/sbus.c
> +++ b/arch/sparc/kernel/sbus.c
> @@ -656,6 +656,8 @@ static void __init sbus_iommu_init(struct platform_device *op)
>   	return;
>
>   fatal_memory_error:
> +	kfree(strbuf);

strbuf will be uninitialized if the iommu allocation fails. I don't have 
a particular preference for how to fix this but tend to dislike initial 
assignment with NULL because it hides other control flow issues.

Regards

Richard

> +	kfree(iommu);
>   	prom_printf("sbus_iommu_init: Fatal memory allocation error.\n");
>   }
>
>
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