From 0000000000000000000000000000000000000000 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/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java index bd807a3d06457e619df0e77cf6114b0802b7d685..8d0f5ca024d7b473f2d5b5e92b190df6502587b0 100644 --- a/src/main/java/net/minecraft/world/entity/Entity.java +++ b/src/main/java/net/minecraft/world/entity/Entity.java @@ -2151,11 +2151,12 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n } else { // CraftBukkit start - Capture drops for death event if (this instanceof net.minecraft.world.entity.LivingEntity && !((net.minecraft.world.entity.LivingEntity) this).forceDrops) { - ((net.minecraft.world.entity.LivingEntity) this).drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asBukkitCopy(stack)); + ((net.minecraft.world.entity.LivingEntity) this).drops.add(org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(stack)); // Paper - mirror so we can destroy it later return null; } // CraftBukkit end - ItemEntity entityitem = new ItemEntity(this.level, this.getX(), this.getY() + (double) yOffset, this.getZ(), stack); + ItemEntity entityitem = new ItemEntity(this.level, this.getX(), this.getY() + (double) yOffset, this.getZ(), stack.copy()); // Paper - clone so we can destroy original + stack.setCount(0); // Paper - destroy this item - if this ever leaks due to game bugs, ensure it doesn't dupe entityitem.setDefaultPickUpDelay(); // CraftBukkit start @@ -2897,6 +2898,12 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n @Nullable public Entity teleportTo(ServerLevel worldserver, BlockPos 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.level instanceof ServerLevel && !this.isRemoved()) { this.level.getProfiler().push("changeDimension"); // CraftBukkit start @@ -2917,6 +2924,11 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n // CraftBukkit end this.level.getProfiler().popPush("reloading"); + // Paper start - Change lead drop timing to prevent dupe + if (this instanceof Mob) { + ((Mob) this).dropLeash(true, true); // Paper drop lead + } + // Paper end Entity entity = this.getType().create((Level) worldserver); if (entity != null) { @@ -2930,10 +2942,6 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n // CraftBukkit start - Forward the CraftEntity to the new entity this.getBukkitEntity().setHandle(entity); entity.bukkitEntity = this.getBukkitEntity(); - - if (this instanceof Mob) { - ((Mob) this).dropLeash(true, false); // Unleash to prevent duping of leads. - } // CraftBukkit end } @@ -3058,7 +3066,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n } public boolean canChangeDimensions() { - return true; + return isAlive() && valid; // Paper } public float getBlockExplosionResistance(Explosion explosion, BlockGetter world, BlockPos pos, BlockState blockState, FluidState fluidState, float max) { diff --git a/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java b/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java index bbde9b758643c087733064a126d90689d71830cf..069cdfce085909991a69ebec3004d407526d469d 100644 --- a/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java +++ b/src/main/java/net/minecraft/world/entity/decoration/ArmorStand.java @@ -611,7 +611,7 @@ public class ArmorStand extends LivingEntity { 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.EMPTY); } } @@ -619,7 +619,7 @@ public class ArmorStand extends LivingEntity { 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.EMPTY); } } diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java index 8e4bd4818cf9d50dec7b94e5f1263086b6a6b86a..09c152123d055432266bbb5a1434c21aed64da1f 100644 --- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java +++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java @@ -807,7 +807,8 @@ 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;