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89d51d5f29
Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable. It should be noted that this decision does not promise all future exploits will be configurable.
40 lines
2.5 KiB
Diff
40 lines
2.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: etil2jz <blanchot.arthur@protonmail.ch>
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Date: Sat, 2 Apr 2022 23:29:24 +0200
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Subject: [PATCH] Fix NBT pieces overriding a block entity during worldgen
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deadlock
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By checking if the world passed into StructureTemplate's placeInWorld
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is not a WorldGenRegion, we can bypass the deadlock entirely.
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See https://bugs.mojang.com/browse/MC-246262
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diff --git a/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java b/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
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index be8aab51a1b92a3a0cc94976975fc3aabc46f0b4..ae8a42261337bf736d0cc1bbe18da2b773417ca4 100644
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--- a/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
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+++ b/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
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@@ -279,7 +279,11 @@ public class StructureTemplate {
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if (definedstructure_blockinfo.nbt != null) {
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tileentity = world.getBlockEntity(blockposition2);
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- Clearable.tryClear(tileentity);
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+ // Paper start - Fix NBT pieces overriding a block entity during worldgen deadlock
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+ if (!(world instanceof net.minecraft.world.level.WorldGenLevel)) {
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+ Clearable.tryClear(tileentity);
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+ }
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+ // Paper end - Fix NBT pieces overriding a block entity during worldgen deadlock
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world.setBlock(blockposition2, Blocks.BARRIER.defaultBlockState(), 20);
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}
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// CraftBukkit start
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@@ -406,7 +410,11 @@ public class StructureTemplate {
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if (pair1.getSecond() != null) {
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tileentity = world.getBlockEntity(blockposition6);
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if (tileentity != null) {
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- tileentity.setChanged();
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+ // Paper start - Fix NBT pieces overriding a block entity during worldgen deadlock
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+ if (!(world instanceof net.minecraft.world.level.WorldGenLevel)) {
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+ tileentity.setChanged();
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+ }
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+ // Paper end - Fix NBT pieces overriding a block entity during worldgen deadlock
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}
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}
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}
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