1 files changed, 6 insertions, 3 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index 9dfb4cac0c41..30df6e7dd807 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1569,8 +1569,8 @@ SYSCALL_DEFINE1(oldumount, char __user *, name)
 static bool is_mnt_ns_file(struct dentry *dentry)
 {
         /* Is this a proxy for a mount namespace? */
-        struct inode *inode = dentry->d_inode;
-        return proc_ns_inode(inode) && dentry->d_fsdata == &mntns_operations;
+        return dentry->d_op == &ns_dentry_operations &&
+               dentry->d_fsdata == &mntns_operations;
 }
 
 struct mnt_namespace *to_mnt_ns(struct ns_common *ns)
@@ -2016,7 +2016,10 @@ static int do_loopback(struct path *path, const char *old_name,
         if (IS_MNT_UNBINDABLE(old))
                 goto out2;
 
-        if (!check_mnt(parent) || !check_mnt(old))
+        if (!check_mnt(parent))
+                goto out2;
+
+        if (!check_mnt(old) && old_path.dentry->d_op != &ns_dentry_operations)
                 goto out2;
 
         if (!recurse && has_locked_children(old, old_path.dentry))