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

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Date:	Mon, 08 Jul 2013 15:52:53 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	mfasheh@...e.com, jlbec@...lplan.org
CC:	ocfs2-devel@....oracle.com,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] ocfs2/refcounttree: add the missing NULL check of the return
 value of find_or_create_page()

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.
-- 
1.7.7

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