[PATCH 4.13 122/160] ovl: fix dput() of ERR_PTR in ovl_cleanup_index()

[Greg Kroah-Hartman]

4.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Amir Goldstein <amir7...@gmail.com>

commit 9f4ec904dbd4eb1a2db10d5e7dc16eae386fe64d upstream.

Fixes: caf70cb2ba5d ("ovl: cleanup orphan index entries")
Signed-off-by: Amir Goldstein <amir7...@gmail.com>
Signed-off-by: Miklos Szeredi <mszer...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/overlayfs/util.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -418,7 +418,7 @@ void ovl_inuse_unlock(struct dentry *den
        }
 }
 
-/* Called must hold OVL_I(inode)->oi_lock */
+/* Caller must hold OVL_I(inode)->lock */
 static void ovl_cleanup_index(struct dentry *dentry)
 {
        struct inode *dir = ovl_indexdir(dentry->d_sb)->d_inode;
@@ -457,6 +457,9 @@ static void ovl_cleanup_index(struct den
        err = PTR_ERR(index);
        if (!IS_ERR(index))
                err = ovl_cleanup(dir, index);
+       else
+               index = NULL;
+
        inode_unlock(dir);
        if (err)
                goto fail;