ocfs2/refcounttree: add the missing NULL check of the return value of find_or_create_...

Add the missing NULL check of the return value of find_or_create_page() in
function ocfs2_duplicate_clusters_by_page().

[akpm@linux-foundation.org: fix layout, per Joel]
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Acked-by: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 998b17e..9f6b96a 100644 (file)
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -2965,6 +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