linux-kernel - Re: [PATCH] ocfs2/refcounttree: add the missing NULL check of the return value of find_or_create

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Date:	Tue, 9 Jul 2013 15:11:18 -0700
From:	Joel Becker <jlbec@...lplan.org>
To:	Gu Zheng <guz.fnst@...fujitsu.com>
Cc:	mfasheh@...e.com, ocfs2-devel@....oracle.com,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ocfs2/refcounttree: add the missing NULL check of the
 return value of find_or_create_page()

On Mon, Jul 08, 2013 at 03:52:53PM +0800, Gu Zheng wrote:
> Add the missing NULL check of the return value of find_or_create_page() in
> function ocfs2_duplicate_clusters_by_page().
> 
> Signed-off-by: Gu Zheng <guz.fnst@...fujitsu.com>
> ---
>  fs/ocfs2/refcounttree.c |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
> index 998b17e..456d0e4 100644
> --- a/fs/ocfs2/refcounttree.c
> +++ b/fs/ocfs2/refcounttree.c
> @@ -2965,7 +2965,11 @@ int ocfs2_duplicate_clusters_by_page(handle_t *handle,
>  			to = map_end & (PAGE_CACHE_SIZE - 1);
> 
>  		page = find_or_create_page(mapping, page_index, GFP_NOFS);
> -
> +		if (!page) {
> +			ret = -ENOMEM;
> +			mlog_errno(ret);
> +			break;
> +		}
>  		/*
>  		 * In case PAGE_CACHE_SIZE <= CLUSTER_SIZE, This page
>  		 * can't be dirtied before we CoW it out.

Put a blank line between the closing brace and the comment.  Otherwise,
Acked-by: Joel Becker <jlbec@...lplan.org>

Joel
> -- 
> 1.7.7
> 
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