--- y/fs/namespace.c
+++ x/fs/namespace.c
@@ -1801,6 +1801,9 @@ int path_umount(struct path *path, int f
 	if (!ret)
 		ret = do_umount(mnt, flags);
 
+	if (ret)
+		return ret;
+
 	/* we mustn't call path_put() as that would clear mnt_expiry_mark */
 	dput(path->dentry);
 	mntput_no_expire(mnt);