Ocfs2 devel - Aug 2013 - [patch 14/22] ocfs2: add the missing return value check of ocfs2_xattr_get_clusters

From: Joseph Qi <joseph.qi at huawei.com>
Subject: ocfs2: add the missing return value check of ocfs2_xattr_get_clusters

In ocfs2_xattr_value_attach_refcount(), if error occurs when calling
ocfs2_xattr_get_clusters(), it will go with unexpected behavior since
local variables p_cluster, num_clusters and ext_flags are declared without
initialization.

Signed-off-by: Joseph Qi <joseph.qi at huawei.com>
Cc: Joel Becker <jlbec at evilplan.org>
Cc: Mark Fasheh <mfasheh at suse.com>
Acked-by: Jie Liu <jeff.liu at oracle.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
---

 fs/ocfs2/xattr.c |    4 ++++
 1 file changed, 4 insertions(+)

diff -puN
fs/ocfs2/xattr.c~ocfs2-add-the-missing-return-value-check-of-ocfs2_xattr_get_clusters
fs/ocfs2/xattr.c
---
a/fs/ocfs2/xattr.c~ocfs2-add-the-missing-return-value-check-of-ocfs2_xattr_get_clusters
+++ a/fs/ocfs2/xattr.c
@@ -5881,6 +5881,10 @@ static int ocfs2_xattr_value_attach_refc
 	while (cpos < clusters) {
 		ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
 					       &num_clusters, el, &ext_flags);
+		if (ret) {
+			mlog_errno(ret);
+			break;
+		}
 
 		cpos += num_clusters;
 		if ((ext_flags & OCFS2_EXT_REFCOUNTED))
_