Purpur/patches/server/0127-PaperPR-Prevent-position-desync-in-playerconnection-.patch

From d3fc90698c11fde0a7c56d6147eb4f7d075abef4 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Fri, 12 Jun 2020 16:51:39 -0700
Subject: [PATCH] PaperPR - Prevent position desync in playerconnection causing
 tp exploit

---
 src/main/java/net/minecraft/server/PlayerConnection.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index 3a1aa1d4da..c13296935c 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -1104,6 +1104,11 @@ public class PlayerConnection implements PacketListenerPlayIn {
                             }
 
                             this.player.move(EnumMoveType.PLAYER, new Vec3D(d7, d8, d9));
+                            // Purpur start - prevent position desync
+                            if (this.teleportPos != null) {
+                                return; // ... thanks Mojang for letting move calls teleport across dimensions.
+                            }
+                            // Purpur end - prevent position desync
                             this.player.onGround = packetplayinflying.b();
                             double d12 = d8;
 
-- 
2.26.2