PaperMC/patches/server/0371-Prevent-position-desync-causing-tp-exploit.patch

From 0000000000000000000000000000000000000000 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] Prevent position desync causing tp exploit

Caused the server to revert to the player's overworld coordinates
after teleporting into the end.

Sidenote: The underlying issue is that the move call can teleport
entities and do other things like kill the entity. In the future,
to fix all exploits derieved from this usually unexpected
behaviour, we need to move all of this dangerous logic outside
of the move call and into an appropriate place in the tick method.

diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 081d916a82a456ebbb56e7255768f4631e0ec797..b6895f7f6df5519f6cc550f154ecc2c3b9043b8f 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -1350,6 +1350,11 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
 
                             this.player.move(MoverType.PLAYER, new Vec3(d6, d7, d8));
                             this.player.onGround = packet.isOnGround(); // CraftBukkit - SPIGOT-5810, SPIGOT-5835, SPIGOT-6828: reset by this.player.move
+                            // Paper start - prevent position desync
+                            if (this.awaitingPositionFromClient != null) {
+                                return; // ... thanks Mojang for letting move calls teleport across dimensions.
+                            }
+                            // Paper end - prevent position desync
                             double d11 = d7;
 
                             d6 = d0 - this.player.getX();