From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Zach Brown Date: Tue, 23 Jul 2019 20:44:47 -0500 Subject: [PATCH] Do not let the server load chunks from newer versions If the server attempts to load a chunk generated by a newer version of the game, immediately stop the server to prevent data corruption. You can override this functionality at your own peril. 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 3c61be19c65b2da9283b2aba2b4e66f84bac6e1c..31e552e1b4c3a6931a61a88a75965a0427d6de8d 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 @@ -126,9 +126,22 @@ public class ChunkSerializer { return holder.protoChunk; } + // Paper start + private static final int CURRENT_DATA_VERSION = SharedConstants.getCurrentVersion().getDataVersion().getVersion(); + private static final boolean JUST_CORRUPT_IT = Boolean.getBoolean("Paper.ignoreWorldDataVersion"); + // Paper end public static InProgressChunkHolder loadChunk(ServerLevel world, PoiManager poiStorage, ChunkPos chunkPos, CompoundTag nbt, boolean distinguish) { java.util.ArrayDeque tasksToExecuteOnMain = new java.util.ArrayDeque<>(); // Paper end + // Paper start - Do NOT attempt to load chunks saved with newer versions + if (nbt.contains("DataVersion", 99)) { + int dataVersion = nbt.getInt("DataVersion"); + if (!JUST_CORRUPT_IT && dataVersion > CURRENT_DATA_VERSION) { + new RuntimeException("Server attempted to load chunk saved with newer version of minecraft! " + dataVersion + " > " + CURRENT_DATA_VERSION).printStackTrace(); + System.exit(1); + } + } + // Paper end ChunkPos chunkcoordintpair1 = new ChunkPos(nbt.getInt("xPos"), nbt.getInt("zPos")); // Paper - diff on change, see ChunkSerializer#getChunkCoordinate if (!Objects.equals(chunkPos, chunkcoordintpair1)) {