--- bdc3cb4fd2220c6fde0f35159a902768a75d60f6
+++ 2beb0fbe70ecc0863d6d17e7e58759c3ab766c84
@@ -1119,8 +1119,15 @@ SYSCALL_DEFINE2(umount, char __user *, n
 {
 	struct path path;
 	int retval;
+	int lookup_flags = 0;
 
-	retval = user_path(name, &path);
+	if (flags & ~(MNT_FORCE | MNT_DETACH | MNT_EXPIRE | UMOUNT_NOFOLLOW))
+		return -EINVAL;
+
+	if (!(flags & UMOUNT_NOFOLLOW))
+		lookup_flags |= LOOKUP_FOLLOW;
+
+	retval = user_path_at(AT_FDCWD, name, lookup_flags, &path);
 	if (retval)
 		goto out;
 	retval = -EINVAL;