Paper/Spigot-Server-Patches/0461-Fix-numerous-item-duplication-issues-and-teleport-is.patch
Mariell Hoversholm 654b792caf Updated Upstream (CraftBukkit)
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

CraftBukkit Changes:
a339310c #755: Fix NPE when calling getInventory() for virtual EnderChests
2577f9bf Increase outdated build delay
1dabfdc8 #754: Fix pre-1.16 serialized SkullMeta being broken on 1.16+, losing textures
2020-09-27 11:04:51 -04:00

104 lines
6.3 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 25 Apr 2020 06:46:35 -0400
Subject: [PATCH] Fix numerous item duplication issues and teleport issues
This notably fixes the newest "Donkey Dupe", but also fixes a lot
of dupe bugs in general around nether portals and entity world transfer
We also fix item duplication generically by anytime we clone an item
to drop it on the ground, destroy the source item.
This avoid an itemstack ever existing twice in the world state pre
clean up stage.
So even if something NEW comes up, it would be impossible to drop the
same item twice because the source was destroyed.
diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 063c5ce566644a59652dec9b306f9f9282560589..7df29df2d6023e549e1fba0b5b1d1c1abcf92f8b 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -1879,11 +1879,12 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
} else {
// CraftBukkit start - Capture drops for death event
if (this instanceof EntityLiving && !((EntityLiving) this).forceDrops) {
- ((EntityLiving) this).drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(itemstack));
+ ((EntityLiving) this).drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemstack)); // Paper - mirror so we can destroy it later
return null;
}
// CraftBukkit end
- EntityItem entityitem = new EntityItem(this.world, this.locX(), this.locY() + (double) f, this.locZ(), itemstack);
+ EntityItem entityitem = new EntityItem(this.world, this.locX(), this.locY() + (double) f, this.locZ(), itemstack.cloneItemStack()); // Paper - clone so we can destroy original
+ itemstack.setCount(0); // Paper - destroy this item - if this ever leaks due to game bugs, ensure it doesn't dupe
entityitem.defaultPickupDelay();
// CraftBukkit start
@@ -2531,6 +2532,12 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
@Nullable
public Entity teleportTo(WorldServer worldserver, BlockPosition location) {
// CraftBukkit end
+ // Paper start - fix bad state entities causing dupes
+ if (!isAlive() || !valid) {
+ LOGGER.warn("Illegal Entity Teleport " + this + " to " + worldserver + ":" + location, new Throwable());
+ return null;
+ }
+ // Paper end
if (this.world instanceof WorldServer && !this.dead) {
this.world.getMethodProfiler().enter("changeDimension");
// CraftBukkit start
@@ -2566,7 +2573,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
entity.bukkitEntity = this.getBukkitEntity();
if (this instanceof EntityInsentient) {
- ((EntityInsentient) this).unleash(true, false); // Unleash to prevent duping of leads.
+ ((EntityInsentient) this).unleash(true, true); // Paper drop lead
}
// CraftBukkit end
}
@@ -2686,7 +2693,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
}
public boolean canPortal() {
- return true;
+ return isAlive() && valid; // Paper
}
public float a(Explosion explosion, IBlockAccess iblockaccess, BlockPosition blockposition, IBlockData iblockdata, Fluid fluid, float f) {
diff --git a/src/main/java/net/minecraft/server/EntityArmorStand.java b/src/main/java/net/minecraft/server/EntityArmorStand.java
index 5c3d2bbf7b2ae22347d251c90c85388779c2cd44..937fa3c69a5cba2fc2fa4506dc34ff8a37dae19c 100644
--- a/src/main/java/net/minecraft/server/EntityArmorStand.java
+++ b/src/main/java/net/minecraft/server/EntityArmorStand.java
@@ -559,7 +559,7 @@ public class EntityArmorStand extends EntityLiving {
for (i = 0; i < this.handItems.size(); ++i) {
itemstack = (ItemStack) this.handItems.get(i);
if (!itemstack.isEmpty()) {
- drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(itemstack)); // CraftBukkit - add to drops
+ drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemstack)); // CraftBukkit - add to drops // Paper - mirror so we can destroy it later - though this call site was safe
this.handItems.set(i, ItemStack.b);
}
}
@@ -567,7 +567,7 @@ public class EntityArmorStand extends EntityLiving {
for (i = 0; i < this.armorItems.size(); ++i) {
itemstack = (ItemStack) this.armorItems.get(i);
if (!itemstack.isEmpty()) {
- drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(itemstack)); // CraftBukkit - add to drops
+ drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemstack)); // CraftBukkit - add to drops // Paper - mirror so we can destroy it later - though this call site was safe
this.armorItems.set(i, ItemStack.b);
}
}
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index ded7ac09b161135885189e1fb71403ef4856ad30..65de5c4e5ffb993d85af2410c44d0149878b6859 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -811,7 +811,8 @@ public class CraftEventFactory {
for (org.bukkit.inventory.ItemStack stack : event.getDrops()) {
if (stack == null || stack.getType() == Material.AIR || stack.getAmount() == 0) continue;
- world.dropItem(entity.getLocation(), stack);
+ world.dropItem(entity.getLocation(), stack); // Paper - note: dropItem already clones due to this being bukkit -> NMS
+ if (stack instanceof CraftItemStack) stack.setAmount(0); // Paper - destroy this item - if this ever leaks due to game bugs, ensure it doesn't dupe, but don't nuke bukkit stacks of manually added items
}
return event;