From 0000000000000000000000000000000000000000 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/world/level/chunk/storage/ChunkSerializer.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java index b0518725a2e145d29bd5bc0aa7e6998a47dcb511..b3f8df13e97cbde7dd914b42004d186f90b78646 100644 --- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java +++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java @@ -88,8 +88,20 @@ public class ChunkSerializer { public ChunkSerializer() {} + // Paper start - guard against serializing mismatching coordinates + // TODO Note: This needs to be re-checked each update + public static ChunkPos getChunkCoordinate(final CompoundTag chunkData) { + final int dataVersion = ChunkStorage.getVersion(chunkData); + if (dataVersion < 2842) { // Level tag is removed after this version + final CompoundTag levelData = chunkData.getCompound("Level"); + return new ChunkPos(levelData.getInt("xPos"), levelData.getInt("zPos")); + } else { + return new ChunkPos(chunkData.getInt("xPos"), chunkData.getInt("zPos")); + } + } + // Paper end - guard against serializing mismatching coordinates public static ProtoChunk read(ServerLevel world, PoiManager poiStorage, ChunkPos chunkPos, CompoundTag nbt) { - ChunkPos chunkcoordintpair1 = new ChunkPos(nbt.getInt("xPos"), nbt.getInt("zPos")); + ChunkPos chunkcoordintpair1 = new ChunkPos(nbt.getInt("xPos"), nbt.getInt("zPos")); // Paper - guard against serializing mismatching coordinates; diff on change, see ChunkSerializer#getChunkCoordinate if (!Objects.equals(chunkPos, chunkcoordintpair1)) { ChunkSerializer.LOGGER.error("Chunk file at {} is in the wrong location; relocating. (Expected {}, got {})", new Object[]{chunkPos, chunkPos, chunkcoordintpair1}); diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkStorage.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkStorage.java index 5ed1b824978c3805e91aeed8e172206ada9fb720..09a73383867d1ffadababd24428ee7a61ab98959 100644 --- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkStorage.java +++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkStorage.java @@ -168,6 +168,13 @@ public class ChunkStorage implements AutoCloseable { } public CompletableFuture write(ChunkPos chunkPos, CompoundTag nbt) { + // Paper start - guard against serializing mismatching coordinates + if (nbt != null && !chunkPos.equals(ChunkSerializer.getChunkCoordinate(nbt))) { + final String world = (this instanceof net.minecraft.server.level.ChunkMap) ? ((net.minecraft.server.level.ChunkMap) this).level.getWorld().getName() : null; + throw new IllegalArgumentException("Chunk coordinate and serialized data do not have matching coordinates, trying to serialize coordinate " + chunkPos + + " but compound says coordinate is " + ChunkSerializer.getChunkCoordinate(nbt) + (world == null ? " for an unknown world" : (" for world: " + world))); + } + // Paper end - guard against serializing mismatching coordinates this.handleLegacyStructureIndex(chunkPos); return this.worker.store(chunkPos, nbt); }