Scissors/patches/server/0030-Prevent-invalid-container-events.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Allink <arclicious@vivaldi.net>
Date: Sun, 10 Jul 2022 02:55:01 +0100
Subject: [PATCH] Prevent invalid container events


diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 77bf4cebd9cb92d6dfd03b6734b50d4457243bc9..f6f5efbf757f1508b628db90c9f63da382ebf4d5 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -30,6 +30,8 @@ import java.util.function.UnaryOperator;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 import javax.annotation.Nullable;
+
+import net.kyori.adventure.text.format.NamedTextColor;
 import net.minecraft.ChatFormatting;
 import net.minecraft.CrashReport;
 import net.minecraft.CrashReportCategory;
@@ -2989,6 +2991,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
     public void handleContainerClick(ServerboundContainerClickPacket packet) {
         PacketUtils.ensureRunningOnSameThread(packet, this, this.player.serverLevel());
         if (this.player.isImmobile()) return; // CraftBukkit
+
         this.player.resetLastActionTime();
         if (this.player.containerMenu.containerId == packet.getContainerId() && this.player.containerMenu.stillValid(this.player)) { // CraftBukkit
             boolean cancelled = this.player.isSpectator(); // CraftBukkit - see below if
@@ -3010,6 +3013,18 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
                         return;
                     }
 
+                    // Scissors start - Do not call events when the slot/button number is invalid
+                    final int sentSlotNum = packet.getSlotNum();
+                    if((Mth.clamp(sentSlotNum, -1, this.player.containerMenu.slots.size() - 1) != sentSlotNum) && sentSlotNum != -999)
+                    {
+                        this.getCraftPlayer().kick(
+                            net.kyori.adventure.text.Component.text("Invalid container click slot (Hacking?)")
+                                .color(NamedTextColor.RED)
+                        );
+                        return;
+                    }
+                    // Scissors end
+
                     InventoryView inventory = this.player.containerMenu.getBukkitView();
                     SlotType type = inventory.getSlotType(packet.getSlotNum());