From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar <aikar@aikar.co> Date: Sat, 2 May 2020 03:09:46 -0400 Subject: [PATCH] Validate PickItem Packet and kick for invalid diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java index 5f12987b93f1578624626c4e911d1757dee3d45f..3f416479e23c60ec5b4b779cce9ab62c74865ac8 100644 --- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java +++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java @@ -881,7 +881,14 @@ public class ServerGamePacketListenerImpl implements ServerGamePacketListener { @Override public void handlePickItem(ServerboundPickItemPacket packet) { PacketUtils.ensureRunningOnSameThread(packet, this, this.player.getLevel()); - this.player.inventory.pickSlot(packet.getSlot()); + // Paper start - validate pick item position + if (!(packet.getSlot() >= 0 && packet.getSlot() < this.player.inventory.items.size())) { + ServerGamePacketListenerImpl.LOGGER.warn("{} tried to set an invalid carried item", this.player.getName().getString()); + this.disconnect("Invalid hotbar selection (Hacking?)"); + return; + } + this.player.inventory.pickSlot(packet.getSlot()); // Paper - Diff above if changed + // Paper end this.player.connection.send(new ClientboundContainerSetSlotPacket(-2, this.player.inventory.selected, this.player.inventory.getItem(this.player.inventory.selected))); this.player.connection.send(new ClientboundContainerSetSlotPacket(-2, packet.getSlot(), this.player.inventory.getItem(packet.getSlot()))); this.player.connection.send(new ClientboundSetCarriedItemPacket(this.player.inventory.selected));