Paper/CraftBukkit-Patches/0080-Guard-Entity-List.patch

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From 6c6bd2c67ce8837dcb7b21a2468a0e5e70b9531d Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Mon, 10 Mar 2014 09:03:28 +1100
Subject: [PATCH] Guard Entity List
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
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index a6bd744..2cc87d0 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
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@@ -33,7 +33,32 @@ public abstract class World implements IBlockAccess {
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private int a = 63;
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protected boolean d;
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- public final List<Entity> entityList = Lists.newArrayList();
+ // Spigot start - guard entity list from removals
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+ public final List<Entity> entityList = new java.util.ArrayList<Entity>()
+ {
+ @Override
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+ public Entity remove(int index)
+ {
+ guard();
+ return super.remove( index );
+ }
+
+ @Override
+ public boolean remove(Object o)
+ {
+ guard();
+ return super.remove( o );
+ }
+
+ private void guard()
+ {
+ if ( guardEntityList )
+ {
+ throw new java.util.ConcurrentModificationException();
+ }
+ }
+ };
+ // Spigot end
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protected final List<Entity> f = Lists.newArrayList();
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public final List<TileEntity> tileEntityList = Lists.newArrayList();
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public final List<TileEntity> tileEntityListTick = Lists.newArrayList();
@@ -101,6 +126,7 @@ public abstract class World implements IBlockAccess {
public final org.spigotmc.SpigotWorldConfig spigotConfig; // Spigot
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public final SpigotTimings.WorldTimingsHandler timings; // Spigot
+ private boolean guardEntityList; // Spigot
public CraftWorld getWorld() {
return this.world;
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@@ -1312,6 +1338,7 @@ public abstract class World implements IBlockAccess {
org.spigotmc.ActivationRange.activateEntities(this); // Spigot
timings.entityTick.startTiming(); // Spigot
+ guardEntityList = true; // Spigot
// CraftBukkit start - Use field for loop variable
for (this.tickPosition = 0; this.tickPosition < this.entityList.size(); ++this.tickPosition) {
entity = (Entity) this.entityList.get(this.tickPosition);
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@@ -1350,12 +1377,15 @@ public abstract class World implements IBlockAccess {
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this.getChunkAt(j, l).b(entity);
}
+ guardEntityList = false; // Spigot
this.entityList.remove(this.tickPosition--); // CraftBukkit - Use field for loop variable
+ guardEntityList = true; // Spigot
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this.c(entity);
}
this.methodProfiler.b();
}
+ guardEntityList = false; // Spigot
timings.entityTick.stopTiming(); // Spigot
this.methodProfiler.c("blockEntities");
--
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2.5.0