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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.
39 lines
2.6 KiB
Diff
39 lines
2.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Nassim Jahnke <nassim@njahnke.dev>
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Date: Fri, 7 Jan 2022 11:45:15 +0100
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Subject: [PATCH] Reset placed block on exception
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diff --git a/src/main/java/net/minecraft/world/item/BlockItem.java b/src/main/java/net/minecraft/world/item/BlockItem.java
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index c19069f65a9ecbc9000ea4333417a2df4ace1007..1ac739c92031e80c35e1af4417e6358346079580 100644
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--- a/src/main/java/net/minecraft/world/item/BlockItem.java
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+++ b/src/main/java/net/minecraft/world/item/BlockItem.java
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@@ -80,6 +80,7 @@ public class BlockItem extends Item {
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if (this instanceof PlaceOnWaterBlockItem || this instanceof SolidBucketItem) {
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blockstate = org.bukkit.craftbukkit.block.CraftBlockStates.getBlockState(blockactioncontext1.getLevel(), blockactioncontext1.getClickedPos());
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}
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+ final org.bukkit.block.BlockState oldBlockstate = blockstate != null ? blockstate : org.bukkit.craftbukkit.block.CraftBlockStates.getBlockState(blockactioncontext1.getLevel(), blockactioncontext1.getClickedPos()); // Paper - Reset placed block on exception
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// CraftBukkit end
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if (iblockdata == null) {
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@@ -95,7 +96,19 @@ public class BlockItem extends Item {
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if (iblockdata1.is(iblockdata.getBlock())) {
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iblockdata1 = this.updateBlockStateFromTag(blockposition, world, itemstack, iblockdata1);
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+ // Paper start - Reset placed block on exception
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+ try {
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this.updateCustomBlockEntityTag(blockposition, world, entityhuman, itemstack, iblockdata1);
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+ } catch (Exception e) {
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+ oldBlockstate.update(true, false);
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+ if (entityhuman instanceof ServerPlayer player) {
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+ org.apache.logging.log4j.LogManager.getLogger().error("Player {} tried placing invalid block", player.getScoreboardName(), e);
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+ player.getBukkitEntity().kickPlayer("Packet processing error");
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+ return InteractionResult.FAIL;
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+ }
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+ throw e; // Rethrow exception if not placed by a player
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+ }
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+ // Paper end - Reset placed block on exception
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iblockdata1.getBlock().setPlacedBy(world, blockposition, iblockdata1, entityhuman, itemstack);
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// CraftBukkit start
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if (blockstate != null) {
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