From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Telesphoreo <me@telesphoreo.me>
Date: Fri, 22 Apr 2022 01:24:05 -0500
Subject: [PATCH] Validate coordinates before attempting to get block entities
 when handling Creative Inventory packets


diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 9df5b678ce4343d0bb54133393f6bbe40fe5366b..4186c5c880e94d858fa7e661a1c795269170cf31 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2990,20 +2990,25 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
         if (this.player.gameMode.isCreative()) {
             boolean flag = packet.getSlotNum() < 0;
             ItemStack itemstack = packet.getItem();
-            CompoundTag nbttagcompound = BlockItem.getBlockEntityData(itemstack);
 
+            CompoundTag nbttagcompound = BlockItem.getBlockEntityData(itemstack);
             if (!itemstack.isEmpty() && nbttagcompound != null && nbttagcompound.contains("x") && nbttagcompound.contains("y") && nbttagcompound.contains("z") && this.player.getBukkitEntity().hasPermission("minecraft.nbt.copy")) { // Spigot
                 BlockPos blockposition = BlockEntity.getPosFromTag(nbttagcompound);
                 // Paper start
-                BlockEntity tileentity = null;
+                // Scissors start - Validate coordinates and whether or not the player can reach them
+                if (Level.isInSpawnableBounds(blockposition) && !isOutsideOfReach(blockposition.getX(), blockposition.getY(), blockposition.getZ())) {
+                    BlockEntity tileentity = null;
                 if (this.player.distanceToSqr(blockposition.getX(), blockposition.getY(), blockposition.getZ()) < 32 * 32 && this.player.getLevel().isLoadedAndInBounds(blockposition)) {
                     tileentity = this.player.level.getBlockEntity(blockposition);
                 }
                 // Paper end
 
-                if (tileentity != null) {
-                    tileentity.saveToItem(itemstack);
+                    if (tileentity != null) {
+                        tileentity.saveToItem(
+                        itemstack);
+                    }
                 }
+                // Scissors end
             }
 
             boolean flag1 = packet.getSlotNum() >= 1 && packet.getSlotNum() <= 45;