From 91c4f7f0ea0b653d15bfabc05f5474f8fa1a8806 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Blot?= <nerzhul@users.noreply.github.com>
Date: Mon, 27 Apr 2020 11:27:27 +0200
Subject: [PATCH] Forbid object:attach(obj, ...) (#9762)

Fixes #9761
---
 src/script/lua_api/l_object.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/script/lua_api/l_object.cpp b/src/script/lua_api/l_object.cpp
index d7afb84da..77e1e7dc2 100644
--- a/src/script/lua_api/l_object.cpp
+++ b/src/script/lua_api/l_object.cpp
@@ -674,8 +674,13 @@ int ObjectRef::l_set_attach(lua_State *L)
 	ServerActiveObject *parent = getobject(parent_ref);
 	if (co == NULL)
 		return 0;
+
 	if (parent == NULL)
 		return 0;
+
+	if (co == parent)
+		throw LuaError("ObjectRef::set_attach: attaching object to itself is not allowed.");
+
 	// Do it
 	int parent_id = 0;
 	std::string bone;