linux-kernel - Re: [Patch] mm/sparse.c: Check the return value of sparse_index

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Message-Id: <20071116133714.876f5246.akpm@linux-foundation.org>
Date:	Fri, 16 Nov 2007 13:37:14 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	WANG Cong <xiyou.wangcong@...il.com>
Cc:	linux-kernel@...r.kernel.org, riel@...hat.com, clameter@....com,
	linux-mm@...ck.org
Subject: Re: [Patch] mm/sparse.c: Check the return value of
 sparse_index_alloc().

On Thu, 15 Nov 2007 21:54:28 +0800
WANG Cong <xiyou.wangcong@...il.com> wrote:

> 
> Since sparse_index_alloc() can return NULL on memory allocation failure,
> we must deal with the failure condition when calling it.
> 
> Signed-off-by: WANG Cong <xiyou.wangcong@...il.com>
> Cc: Christoph Lameter <clameter@....com>
> Cc: Rik van Riel <riel@...hat.com>
> 
> ---
> 
> diff --git a/Makefile b/Makefile
> diff --git a/mm/sparse.c b/mm/sparse.c
> index e06f514..d245e59 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -83,6 +83,8 @@ static int __meminit sparse_index_init(unsigned long section_nr, int nid)
>  		return -EEXIST;
>  
>  	section = sparse_index_alloc(nid);
> +	if (!section)
> +		return -ENOMEM;
>  	/*
>  	 * This lock keeps two different sections from
>  	 * reallocating for the same index

Sure, but both callers of sparse_index_init() ignore its return value anyway.
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