ocfs2: add missing return value check of ocfs2_get_clusters()

In ocfs2_attach_refcount_tree() and ocfs2_duplicate_extent_list(), if
error occurs when calling ocfs2_get_clusters(), it will go with
unexpected behavior as local variables p_cluster, num_clusters and
ext_flags are declared without initialization.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Reviewed-by: Jie Liu <jeff.liu@oracle.com>
Cc: 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>

1 files changed, 8 insertions, 2 deletions

diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index a70d604593b6..bf4dfc14bb2c 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -3854,7 +3854,10 @@ static int ocfs2_attach_refcount_tree(struct inode *inode,
         while (cpos < clusters) {
                 ret = ocfs2_get_clusters(inode, cpos, &p_cluster,
                                          &num_clusters, &ext_flags);
-
+                if (ret) {
+                        mlog_errno(ret);
+                        goto unlock;
+                }
                 if (p_cluster && !(ext_flags & OCFS2_EXT_REFCOUNTED)) {
                         ret = ocfs2_add_refcount_flag(inode, &di_et,
                                                       &ref_tree->rf_ci,
@@ -4025,7 +4028,10 @@ static int ocfs2_duplicate_extent_list(struct inode *s_inode,
         while (cpos < clusters) {
                 ret = ocfs2_get_clusters(s_inode, cpos, &p_cluster,
                                          &num_clusters, &ext_flags);
-
+                if (ret) {
+                        mlog_errno(ret);
+                        goto out;
+                }
                 if (p_cluster) {
                         ret = ocfs2_add_refcounted_extent(t_inode, &et,
                                                           ref_ci, ref_root_bh,