Paper/patches/server/0361-Validate-PickItem-Packet-and-kick-for-invalid.patch
Jake Potrebic cc4614854a
405
2024-04-23 23:44:48 -07:00

27 lines
1.9 KiB
Diff

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 eae6e3aeaca1b567698eaa05ed02c6c45717d7f6..6a490ba55e5af694b68bf6bf1677afc7f4f3679f 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -898,7 +898,14 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
@Override
public void handlePickItem(ServerboundPickItemPacket packet) {
PacketUtils.ensureRunningOnSameThread(packet, this, this.player.serverLevel());
- this.player.getInventory().pickSlot(packet.getSlot());
+ // Paper start - validate pick item position
+ if (!(packet.getSlot() >= 0 && packet.getSlot() < this.player.getInventory().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.getInventory().pickSlot(packet.getSlot()); // Paper - Diff above if changed
+ // Paper end - validate pick item position
this.player.connection.send(new ClientboundContainerSetSlotPacket(-2, 0, this.player.getInventory().selected, this.player.getInventory().getItem(this.player.getInventory().selected)));
this.player.connection.send(new ClientboundContainerSetSlotPacket(-2, 0, packet.getSlot(), this.player.getInventory().getItem(packet.getSlot())));
this.player.connection.send(new ClientboundSetCarriedItemPacket(this.player.getInventory().selected));