From 8e8e3b451fd7a632f61a0cc503feacb904487da4 Mon Sep 17 00:00:00 2001 From: Spottedleaf Date: Fri, 27 Dec 2019 09:42:26 -0800 Subject: [PATCH] Guard against serializing mismatching chunk coordinate Should help if something dumb happens diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java index 26f1a4b09..4349d22cc 100644 --- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java +++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java @@ -23,6 +23,13 @@ public class ChunkRegionLoader { private static final Logger LOGGER = LogManager.getLogger(); + // Paper start - guard against serializing mismatching coordinates + // TODO Note: This needs to be re-checked each update + public static ChunkCoordIntPair getChunkCoordinate(NBTTagCompound chunkData) { + NBTTagCompound levelData = chunkData.getCompound("Level"); + return new ChunkCoordIntPair(levelData.getInt("xPos"), levelData.getInt("zPos")); + } + // Paper end // Paper start public static final class InProgressChunkHolder { @@ -48,8 +55,8 @@ public class ChunkRegionLoader { // Paper end ChunkGenerator chunkgenerator = worldserver.getChunkProvider().getChunkGenerator(); WorldChunkManager worldchunkmanager = chunkgenerator.getWorldChunkManager(); - NBTTagCompound nbttagcompound1 = nbttagcompound.getCompound("Level"); - ChunkCoordIntPair chunkcoordintpair1 = new ChunkCoordIntPair(nbttagcompound1.getInt("xPos"), nbttagcompound1.getInt("zPos")); + NBTTagCompound nbttagcompound1 = nbttagcompound.getCompound("Level"); // Paper - diff on change, see ChunkRegionLoader#getChunkCoordinate + ChunkCoordIntPair chunkcoordintpair1 = new ChunkCoordIntPair(nbttagcompound1.getInt("xPos"), nbttagcompound1.getInt("zPos")); // Paper - diff on change, see ChunkRegionLoader#getChunkCoordinate if (!Objects.equals(chunkcoordintpair, chunkcoordintpair1)) { ChunkRegionLoader.LOGGER.error("Chunk file at {} is in the wrong location; relocating. (Expected {}, got {})", chunkcoordintpair, chunkcoordintpair, chunkcoordintpair1); diff --git a/src/main/java/net/minecraft/server/IChunkLoader.java b/src/main/java/net/minecraft/server/IChunkLoader.java index 134c76065..25c8b131f 100644 --- a/src/main/java/net/minecraft/server/IChunkLoader.java +++ b/src/main/java/net/minecraft/server/IChunkLoader.java @@ -106,6 +106,13 @@ public class IChunkLoader extends RegionFileCache implements AutoCloseable { // public void a(ChunkCoordIntPair chunkcoordintpair, NBTTagCompound nbttagcompound) throws IOException { write(chunkcoordintpair, nbttagcompound); } // Paper OBFHELPER public void write(ChunkCoordIntPair chunkcoordintpair, NBTTagCompound nbttagcompound) throws IOException { // Paper - OBFHELPER - (Switched around for safety) + // Paper start + if (!chunkcoordintpair.equals(ChunkRegionLoader.getChunkCoordinate(nbttagcompound))) { + String world = (this instanceof PlayerChunkMap) ? ((PlayerChunkMap)this).world.getWorld().getName() : null; + throw new IllegalArgumentException("Chunk coordinate and serialized data do not have matching coordinates, trying to serialize coordinate " + chunkcoordintpair.toString() + + " but compound says coordinate is " + ChunkRegionLoader.getChunkCoordinate(nbttagcompound).toString() + (world == null ? " for an unknown world" : (" for world: " + world))); + } + // Paper end super.write(chunkcoordintpair, nbttagcompound); if (this.c != null) { synchronized (this.persistentDataLock) { // Paper - Async chunk loading -- 2.25.0.windows.1