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27 lines
1.5 KiB
Diff
27 lines
1.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Tue, 8 Aug 2023 17:29:33 -0700
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Subject: [PATCH] Fix race condition on UpgradeData.BlockFixers class init
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The CHUNKY_FIXERS field is modified during the constructors
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of the BlockFixers, but the code that uses CHUNKY_FIXERS does
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not properly ensure that BlockFixers has been initialised before
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using it, leading to a possible race condition where instances of
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BlockFixers are accessed before they have initialised correctly.
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We can force the class to initialise fully before accessing the
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field by calling any method on the class, and for convenience
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we use values().
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diff --git a/src/main/java/net/minecraft/world/level/chunk/UpgradeData.java b/src/main/java/net/minecraft/world/level/chunk/UpgradeData.java
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index ce3d79ebc7f933d0b34b3f8f71bbec872076847a..ce84851c0c2bf9a066fd5e07be8635d3dcaea0b9 100644
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--- a/src/main/java/net/minecraft/world/level/chunk/UpgradeData.java
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+++ b/src/main/java/net/minecraft/world/level/chunk/UpgradeData.java
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@@ -153,6 +153,7 @@ public class UpgradeData {
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Fluid fluid = tick.type() == Fluids.EMPTY ? level.getFluidState(tick.pos()).getType() : tick.type();
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level.scheduleTick(tick.pos(), fluid, tick.delay(), tick.priority());
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});
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+ UpgradeData.BlockFixers.values(); // Paper - force the class init so that we don't access CHUNKY_FIXERS before all BlockFixers are initialised
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CHUNKY_FIXERS.forEach(logic -> logic.processChunk(level));
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}
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