From 8149ec3bd0119fb06e7bd4dbba208332d2ec6bf8 Mon Sep 17 00:00:00 2001
From: Nassim Jahnke <nassim@njahnke.dev>
Date: Mon, 22 Apr 2024 15:18:18 +0200
Subject: [PATCH] Prevent adding self in compound tag

---
 pom.xml                                                        | 2 +-
 .../com/github/steveice10/opennbt/tag/builtin/CompoundTag.java | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/pom.xml b/pom.xml
index a44b5a1..294fa94 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 
     <groupId>com.viaversion</groupId>
     <artifactId>nbt</artifactId>
-    <version>4.4.3</version>
+    <version>4.4.4</version>
     <packaging>jar</packaging>
 
     <name>ViaNBT</name>
diff --git a/src/main/java/com/github/steveice10/opennbt/tag/builtin/CompoundTag.java b/src/main/java/com/github/steveice10/opennbt/tag/builtin/CompoundTag.java
index 483b38b..a149874 100644
--- a/src/main/java/com/github/steveice10/opennbt/tag/builtin/CompoundTag.java
+++ b/src/main/java/com/github/steveice10/opennbt/tag/builtin/CompoundTag.java
@@ -330,6 +330,9 @@ public final class CompoundTag extends Tag implements Iterable<Entry<String, Tag
      */
     @Nullable
     public <T extends Tag> T put(String tagName, T tag) {
+        if (tag == this) {
+            throw new IllegalArgumentException("Cannot add a tag to itself");
+        }
         return (T) this.value.put(tagName, tag);
     }