Paper/Spigot-Server-Patches/0348-Entity-add-to-world-fixes.patch
Aikar aea67db7a0
make dupe uuid saferegen delete range configurable
also ensure we never process already valid entities. this shouldnt be possible as of recent
commits as we made the entity slice array safer, but doesn't hurt for this logic to be safe too
incase that patch got dropped in a future version by accident/necessarily
2018-08-04 00:26:56 -04:00

88 lines
3.9 KiB
Diff

From 2a5ab03010c297502ce4c62084fbd321cd567634 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Fri, 3 Aug 2018 22:47:46 -0400
Subject: [PATCH] Entity add to world fixes
1) Chunk Registration might kill an entity, don't add it to the world if it did!
2) By default, entities are added to the world per slice iteration.
This opens risk of the slices being manipulated during chunk add if an
EntityAddToWorldEvent spawns an entity into this chunk.
Fix this by differing entity add to world for all entities at the same time
3) If a duplicate entity is attempted to add to the world of an entity, and
the original entity is dead, overwrite it as the logic does for unloaod queued entities.
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 575ddcb2a0..3d512d7595 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -888,6 +888,7 @@ public class Chunk {
this.world.b(this.tileEntities.values());
List[] aentityslice = this.entitySlices; // Spigot
int i = aentityslice.length;
+ List<Entity> toAdd = new java.util.ArrayList<>(32); // Paper
for (int j = 0; j < i; ++j) {
List entityslice = aentityslice[j]; // Spigot
@@ -934,10 +935,12 @@ public class Chunk {
thisChunk.put(entity.uniqueID, entity);
}
}
- // Paper end
- this.world.a((Collection) entityslice);
+ //this.world.a((Collection) entityslice); // Move down, add all entities at same time
+ toAdd.addAll(entityslice);
+ // Paper end
}
+ this.world.addChunkEntities(toAdd); // Paper - add all at same time to avoid entities adding to world modifying slice state
}
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 2ad7c75d2b..c04a9d5a09 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1204,6 +1204,7 @@ public abstract class World implements IBlockAccess {
}
this.getChunkAt(i, j).a(entity);
+ if (entity.dead) return false; // Paper - don't add dead entities, chunk registration may of killed it
this.entityList.add(entity);
this.b(entity);
return true;
@@ -2743,6 +2744,7 @@ public abstract class World implements IBlockAccess {
return i;
}
+ public void addChunkEntities(Collection<Entity> collection) { a(collection); } // Paper - OBFHELPER
public void a(Collection<Entity> collection) {
org.spigotmc.AsyncCatcher.catchOp( "entity world add"); // Spigot
// CraftBukkit start
@@ -2752,7 +2754,7 @@ public abstract class World implements IBlockAccess {
while (iterator.hasNext()) {
Entity entity = (Entity) iterator.next();
- if (entity == null) {
+ if (entity == null || entity.dead || entity.valid) { // Paper - prevent adding already added or dead entities
continue;
}
this.entityList.add(entity);
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index 1244baf45a..a14b5e0618 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -1173,7 +1173,7 @@ public class WorldServer extends World implements IAsyncTaskHandler {
if (this.entitiesByUUID.containsKey(uuid)) {
Entity entity1 = (Entity) this.entitiesByUUID.get(uuid);
- if (this.f.contains(entity1)) {
+ if (this.f.contains(entity1) || entity1.dead) { // Paper - if dupe is dead, overwrite
this.f.remove(entity1);
} else {
if (!(entity instanceof EntityHuman)) {
--
2.18.0