Paper/patches/server/0794-Prevent-sending-oversized-item-data-in-equipment-and.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Nassim Jahnke <jahnke.nassim@gmail.com>
Date: Wed, 1 Dec 2021 12:36:25 +0100
Subject: [PATCH] Prevent sending oversized item data in equipment and metadata
diff --git a/src/main/java/net/minecraft/network/syncher/EntityDataSerializers.java b/src/main/java/net/minecraft/network/syncher/EntityDataSerializers.java
index 0c79613597e9ed1fbeeb36e9cb60a70bbda17bb9..79593d42ef881aa96eab7ea1e50683fa48ff4896 100644
--- a/src/main/java/net/minecraft/network/syncher/EntityDataSerializers.java
+++ b/src/main/java/net/minecraft/network/syncher/EntityDataSerializers.java
@@ -38,7 +38,7 @@ public class EntityDataSerializers {
public static final EntityDataSerializer<ItemStack> ITEM_STACK = new EntityDataSerializer<ItemStack>() {
@Override
public void write(FriendlyByteBuf buf, ItemStack value) {
- buf.writeItem(value);
+ buf.writeItem(net.minecraft.world.entity.LivingEntity.sanitizeItemStack(value, false)); // Paper - prevent oversized data
}
@Override
diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
index cc418554b655ea4111631e4a1abf69776e150e7c..319dfa82dff1fe188a52bed5aa2d39575853b793 100644
--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
@@ -309,7 +309,10 @@ public class ServerEntity {
ItemStack itemstack = ((LivingEntity) this.entity).getItemBySlot(enumitemslot);
if (!itemstack.isEmpty()) {
- list.add(Pair.of(enumitemslot, itemstack.copy()));
+ // Paper start - prevent oversized data
+ final ItemStack sanitized = LivingEntity.sanitizeItemStack(itemstack.copy(), false);
+ list.add(Pair.of(enumitemslot, sanitized));
+ // Paper end
}
}
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index b093d6552c0b0262414ac3e14a99f2d2eea6ce0e..0e4dcab5d77c60bfe7f3bc35c95c4da1f7f06800 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3109,7 +3109,10 @@ public abstract class LivingEntity extends Entity {
equipmentChanges.forEach((enumitemslot, itemstack) -> {
ItemStack itemstack1 = itemstack.copy();
- list.add(Pair.of(enumitemslot, itemstack1));
+ // Paper start - prevent oversized data
+ ItemStack toSend = sanitizeItemStack(itemstack1, true);
+ list.add(Pair.of(enumitemslot, toSend));
+ // Paper end
switch (enumitemslot.getType()) {
case HAND:
this.setLastHandItem(enumitemslot, itemstack1);
@@ -3122,6 +3125,34 @@ public abstract class LivingEntity extends Entity {
((ServerLevel) this.level).getChunkSource().broadcast(this, new ClientboundSetEquipmentPacket(this.getId(), list));
}
+ // Paper start - prevent oversized data
+ public static ItemStack sanitizeItemStack(final ItemStack itemStack, final boolean copyItemStack) {
+ if (itemStack.isEmpty() || !itemStack.hasTag()) {
+ return itemStack;
+ }
+
+ final ItemStack copy = copyItemStack ? itemStack.copy() : itemStack;
+ final CompoundTag tag = copy.getTag();
+ if (copy.is(Items.BUNDLE) && tag.get("Items") instanceof ListTag oldItems && !oldItems.isEmpty()) {
+ // Bundles change their texture based on their fullness.
+ org.bukkit.inventory.meta.BundleMeta bundleMeta = (org.bukkit.inventory.meta.BundleMeta) copy.asBukkitMirror().getItemMeta();
+ int sizeUsed = 0;
+ for (org.bukkit.inventory.ItemStack item : bundleMeta.getItems()) {
+ int scale = 64 / item.getMaxStackSize();
+ sizeUsed += scale * item.getAmount();
+ }
+ // Now we add a single fake item that uses the same amount of slots as all other items.
+ ListTag items = new ListTag();
+ items.add(new ItemStack(Items.PAPER, sizeUsed).save(new CompoundTag()));
+ tag.put("Items", items);
+ }
+ if (tag.get("BlockEntityTag") instanceof CompoundTag blockEntityTag) {
+ blockEntityTag.remove("Items");
+ }
+ return copy;
+ }
+ // Paper end
+
private ItemStack getLastArmorItem(EquipmentSlot slot) {
return (ItemStack) this.lastArmorItemStacks.get(slot.getIndex());
}