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Defensively copy chunk data in upgradeChunkTag

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The data provided is always from the regionfile thread, which
does not copy the data out. So if two separate calls need
the data, then there's going to be a problem.
This commit is contained in:
Spottedleaf 2021-12-27 04:11:21 -08:00
parent 4c43d2f2b9
commit 2ecc06a8fb
1 changed files with 8 additions and 0 deletions
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8
patches/server/Asynchronous-chunk-IO-and-loading.patch
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@ -3219,6 +3219,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
CompoundTag level = nbt.getCompound("Level");
if (level.getBoolean("TerrainPopulated")) {
@@ -0,0 +0,0 @@ public class ChunkStorage implements AutoCloseable {
public CompoundTag upgradeChunkTag(ResourceKey<LevelStem> resourcekey, Supplier<DimensionDataStorage> supplier, CompoundTag nbttagcompound, Optional<ResourceKey<Codec<? extends ChunkGenerator>>> optional, ChunkPos pos, @Nullable LevelAccessor generatoraccess) throws IOException {
// CraftBukkit end
+ nbttagcompound = nbttagcompound.copy(); // Paper - defensive copy, another thread might modify this
int i = ChunkStorage.getVersion(nbttagcompound);
// CraftBukkit start
@@ -0,0 +0,0 @@ public class ChunkStorage implements AutoCloseable {
if (i < 1493) {
nbttagcompound = NbtUtils.update(this.fixerUpper, DataFixTypes.CHUNK, nbttagcompound, i, 1493);
if (nbttagcompound.getCompound("Level").getBoolean("hasLegacyStructureData")) {