From 6d8123ebcd0e5fb73edf748ea1245358cbd7d67d Mon Sep 17 00:00:00 2001
From: Kurt Thiemann <kurt@aternos.org>
Date: Fri, 10 Sep 2021 17:19:16 +0200
Subject: [PATCH] don't accept stings longer than 0xffff

---
 src/Tag/StringTag.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Tag/StringTag.php b/src/Tag/StringTag.php
index e6457b6..2352135 100644
--- a/src/Tag/StringTag.php
+++ b/src/Tag/StringTag.php
@@ -39,10 +39,15 @@ public function getLength(): int
 
     /**
      * @inheritDoc
+     * @throws \Exception
      */
     public function generatePayload(NbtSerializer $serializer): string
     {
-        return $serializer->encodeStringLengthPrefix(strlen($this->value)) . $this->value;
+        $length = strlen($this->value);
+        if($length > 0xffff) {
+            throw new \Exception("String exceeds maximum length of " . 0xffff . " characters");
+        }
+        return $serializer->encodeStringLengthPrefix($length) . $this->value;
     }
 
     /**