ext4: check return of ext4_orphan_get properly

This patch fix a panic while running fsfuzzer. 
We are improperly checking the return of ext4_orphan_get.

Signed-off-by: Josef Bacik <jbacik@redhat.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index c81a8e759bad..425f42778efa 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1594,8 +1594,8 @@ static void ext4_orphan_cleanup (struct super_block * sb,
         while (es->s_last_orphan) {
                 struct inode *inode;
 
-                if (!(inode =
-                      ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
+                inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
+                if (IS_ERR(inode)) {
                         es->s_last_orphan = 0;
                         break;
                 }