linux-kernel - Re: [PATCH] powerpc/nvram: Fix a memory leak in err path

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Date:	Wed, 9 Dec 2015 09:21:25 -0600
From:	Nathan Fontenot <nfont@...ux.vnet.ibm.com>
To:	xinhui <xinhui.pan@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Cc:	Andrzej Hajda <a.hajda@...sung.com>,
	Christophe Jaillet <christophe.jaillet@...adoo.fr>,
	Hari Bathini <hbathini@...ux.vnet.ibm.com>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH] powerpc/nvram: Fix a memory leak in err path

On 12/09/2015 04:00 AM, xinhui wrote:
> 
> If kmemdup fails, We need kfree *buff* first then return -ENOMEM.
> Otherwise there is a memory leak.
> 
> Signed-off-by: Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>

Reviewed-by: Nathan Fontenot <nfont@...ux.vnet.ibm.com>

> ---
>  arch/powerpc/kernel/nvram_64.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
> index 32e2652..21a278b7 100644
> --- a/arch/powerpc/kernel/nvram_64.c
> +++ b/arch/powerpc/kernel/nvram_64.c
> @@ -542,9 +542,9 @@ static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,
>  			time->tv_nsec = 0;
>  		}
>  		*buf = kmemdup(buff + hdr_size, length, GFP_KERNEL);
> +		kfree(buff);
>  		if (*buf == NULL)
>  			return -ENOMEM;
> -		kfree(buff);
>  
>  		if (err_type == ERR_TYPE_KERNEL_PANIC_GZ)
>  			*compressed = true;
> 

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