linux-kernel - Re: [PATCH] kexec: fix memory leak in function kimage_normal_alloc

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Message-ID: <20130222225400.GD4737@verge.net.au>
Date:	Fri, 22 Feb 2013 14:54:01 -0800
From:	Simon Horman <horms@...ge.net.au>
To:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kexec: fix memory leak in function kimage_normal_alloc

On Fri, Feb 22, 2013 at 12:36:13PM +0800, Zhang Yanfei wrote:
> If kimage_normal_alloc() fails to alloc pages for image->swap_page, it
> should call kimage_free_page_list() to free allocated pages in
> image->control_pages list before it frees image.
> 
> Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Sasha Levin <sasha.levin@...cle.com>
> Signed-off-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>


Reviewed-by: Simon Horman <horms@...ge.net.au>

> ---
>  kernel/kexec.c |   18 ++++++++++--------
>  1 files changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/kernel/kexec.c b/kernel/kexec.c
> index 5e4bd78..a57face 100644
> --- a/kernel/kexec.c
> +++ b/kernel/kexec.c
> @@ -223,6 +223,8 @@ out:
>  
>  }
>  
> +static void kimage_free_page_list(struct list_head *list);
> +
>  static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry,
>  				unsigned long nr_segments,
>  				struct kexec_segment __user *segments)
> @@ -248,22 +250,22 @@ static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry,
>  					   get_order(KEXEC_CONTROL_PAGE_SIZE));
>  	if (!image->control_code_page) {
>  		printk(KERN_ERR "Could not allocate control_code_buffer\n");
> -		goto out;
> +		goto out_free;
>  	}
>  
>  	image->swap_page = kimage_alloc_control_pages(image, 0);
>  	if (!image->swap_page) {
>  		printk(KERN_ERR "Could not allocate swap buffer\n");
> -		goto out;
> +		goto out_free;
>  	}
>  
> -	result = 0;
> - out:
> -	if (result == 0)
> -		*rimage = image;
> -	else
> -		kfree(image);
> +	*rimage = image;
> +	return 0;
>  
> +out_free:
> +	kimage_free_page_list(&image->control_pages);
> +	kfree(image);
> +out:
>  	return result;
>  }
>  
> -- 
> 1.7.1
> 
> _______________________________________________
> kexec mailing list
> kexec@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec
> 
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