From 9fc018ded10225589d2559d24a5db739e891fb31 Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Sun, 29 May 2022 16:00:44 +0200
Subject: [PATCH] Fix use-after-free in node meta cleanup

bug introduced in 8908a9101608d3343023b470743ef63f1c44b0b7
---
 src/script/lua_api/l_nodemeta.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/script/lua_api/l_nodemeta.cpp b/src/script/lua_api/l_nodemeta.cpp
index 514a1b78b..bdc4844c0 100644
--- a/src/script/lua_api/l_nodemeta.cpp
+++ b/src/script/lua_api/l_nodemeta.cpp
@@ -66,8 +66,10 @@ void NodeMetaRef::reportMetadataChange(const std::string *name)
 	NodeMetadata *meta = dynamic_cast<NodeMetadata*>(getmeta(false));
 
 	// If the metadata is now empty, get rid of it
-	if (meta && meta->empty())
+	if (meta && meta->empty()) {
 		clearMeta();
+		meta = nullptr;
+	}
 
 	MapEditEvent event;
 	event.type = MEET_BLOCK_NODE_METADATA_CHANGED;