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Ensure chunks are always loaded on hard position sets

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Player Movement, Entity Creation and Teleportation move
entities with a very "You are here, no debate" change, making
the server register them as there, regardless if that chunk was
loaded or not.

It appears possible that with hack clients and lag, a player
may be able to move fast enough to move into an unloaded
chunk and get into a buggy state.

To prevent this, we will ensure a chunk is always loaded,
guaranteeing that the entity will be properly registered
into its new home comfortably.

Closes #1316
This commit is contained in:
Aikar 2018-08-16 17:46:38 -04:00
parent 29da1d351d
commit 0661cf198e
1 changed files with 31 additions and 0 deletions
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Spigot-Server-Patches/Ensure-chunks-are-always-loaded-on-hard-position-set.patch Normal file
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 16 Aug 2018 17:36:41 -0400
Subject: [PATCH] Ensure chunks are always loaded on hard position sets
Player Movement, Entity Creation and Teleportation move
entities with a very "You are here, no debate" change, making
the server register them as there, regardless if that chunk was
loaded or not.
It appears possible that with hack clients and lag, a player
may be able to move fast enough to move into an unloaded
chunk and get into a buggy state.
To prevent this, we will ensure a chunk is always loaded,
guaranteeing that the entity will be properly registered
into its new home comfortably.
diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 9b5f7fcf72..3c279d3fe8 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -0,0 +0,0 @@ public abstract class Entity implements ICommandListener, KeyedObject { // Paper
this.lastYaw -= 360.0F;
}
+ world.getChunkAt((int) Math.floor(this.locX), (int) Math.floor(this.locZ)); // Paper - ensure chunk is always loaded
this.setPosition(this.locX, this.locY, this.locZ);
this.setYawPitch(f, f1);
}
--