From ef076ea837adf53c30c9e890133c866ac5c03288 Mon Sep 17 00:00:00 2001 From: Aikar Date: Thu, 26 Jul 2018 00:11:12 -0400 Subject: [PATCH] Prevent Saving Bad entities to chunks See https://github.com/PaperMC/Paper/issues/1223 Minecraft is saving invalid entities to the chunk files. Avoid saving bad data, and also make improvements to handle loading these chunks. Any invalid entity will be instant killed, so lets avoid adding it to the world... This lets us be safer about the dupe UUID resolver too, as now we can ignore instant killed entities and avoid risk of duplicating an invalid entity. This should reduce log occurrences of dupe uuid messages. diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java index 0fed039f34..2e9686b432 100644 --- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java +++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java @@ -304,6 +304,7 @@ public class ChunkRegionLoader { NBTTagCompound nbttagcompound4; Iterator iterator1; + java.util.List toUpdate = new java.util.ArrayList<>(); // Paper if (ichunkaccess.getChunkStatus().getType() == ChunkStatus.Type.LEVELCHUNK) { Chunk chunk = (Chunk) ichunkaccess; @@ -314,6 +315,16 @@ public class ChunkRegionLoader { while (iterator2.hasNext()) { Entity entity = (Entity) iterator2.next(); + // Paper start + if ((int)Math.floor(entity.locX) >> 4 != chunk.getPos().x || (int)Math.floor(entity.locZ) >> 4 != chunk.getPos().z) { + LogManager.getLogger().warn(entity + " is not in this chunk, skipping save. This a bug fix to a vanilla bug. Do not report this to PaperMC please."); + toUpdate.add(entity); + continue; + } + if (entity.dead) { + continue; + } + // Paper end nbttagcompound4 = new NBTTagCompound(); if (entity.d(nbttagcompound4)) { @@ -322,6 +333,13 @@ public class ChunkRegionLoader { } } } + + // Paper start - move entities to the correct chunk + for (Entity entity : toUpdate) { + ((WorldServer)world).entityJoinedWorld(entity); + } + // Paper end + } else { ProtoChunk protochunk = (ProtoChunk) ichunkaccess; -- 2.21.0