From 93db05c5d0cdd9759162cf22844ab6801120ebd9 Mon Sep 17 00:00:00 2001 From: Aikar 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 9bb5a4bcf1..14ba037c1d 100644 --- a/src/main/java/net/minecraft/server/Entity.java +++ b/src/main/java/net/minecraft/server/Entity.java @@ -1966,11 +1966,12 @@ 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 @@ -2632,6 +2633,12 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke @Nullable public Entity teleportTo(DimensionManager dimensionmanager, BlockPosition location) { // CraftBukkit end + // Paper start - fix bad state entities causing dupes + if (!isAlive() || !valid) { + LOGGER.warn("Illegal Entity Teleport " + this + " to " + dimensionmanager + ":" + location, new Throwable()); + return null; + } + // Paper end if (!this.world.isClientSide && !this.dead) { this.world.getMethodProfiler().enter("changeDimension"); MinecraftServer minecraftserver = this.getMinecraftServer(); @@ -2757,7 +2764,7 @@ 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 8ad131e4fc..d35a0b2d94 100644 --- a/src/main/java/net/minecraft/server/EntityArmorStand.java +++ b/src/main/java/net/minecraft/server/EntityArmorStand.java @@ -557,7 +557,7 @@ 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.a); } } @@ -565,7 +565,7 @@ 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.a); } } diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java index c3f7e46121..b0942e88e1 100644 --- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java +++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java @@ -776,7 +776,8 @@ 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 + stack.setAmount(0); // Paper - destroy this item - if this ever leaks due to game bugs, ensure it doesn't dupe } return event; -- 2.26.2