Fix banner crash exploit

patches/server/0014-Fix-some-creative-exploits.patch

@@ -1,4 +1,4 @@
-From 4adef32d2418f5c1e1891346b655557e5850790e Mon Sep 17 00:00:00 2001
+From 04c6b026af4aad5996388baee237f473969290cb Mon Sep 17 00:00:00 2001
 From: Samsuik <[email protected]>
 Date: Tue, 9 May 2023 16:43:24 +0100
 Subject: [PATCH] Fix some creative exploits
@@ -260,6 +260,56 @@ index 863e9d8e9..0b3fe9930 100644
              entityliving.heal((float) j, RegainReason.MAGIC); // CraftBukkit
          }
 
+diff --git a/src/main/java/net/minecraft/server/TileEntityBanner.java b/src/main/java/net/minecraft/server/TileEntityBanner.java
+index aa5ad2ef0..8778e1ce9 100644
+--- a/src/main/java/net/minecraft/server/TileEntityBanner.java
++++ b/src/main/java/net/minecraft/server/TileEntityBanner.java
+@@ -19,11 +19,7 @@ public class TileEntityBanner extends TileEntity {
+             NBTTagCompound nbttagcompound = itemstack.getTag().getCompound("BlockEntityTag");
+
+             if (nbttagcompound.hasKey("Patterns")) {
+-                this.patterns = (NBTTagList) nbttagcompound.getList("Patterns", 10).clone();
+-                // CraftBukkit start
+-                while (this.patterns.size() > 20) {
+-                    this.patterns.a(20); // PAIL Rename remove
+-                }
++                this.patterns = loadPatternsFromCompound(nbttagcompound); // Blossom - avoid o(n^2) removal of unnecessary patterns
+                 // CraftBukkit end
+             }
+
+@@ -42,6 +38,18 @@ public class TileEntityBanner extends TileEntity {
+         this.g = true;
+     }
+
++    // Blossom start
++    private NBTTagList loadPatternsFromCompound(NBTTagCompound nbttagcompound) {
++        NBTTagList list = nbttagcompound.getList("Patterns", 10);
++        NBTTagList patterns = new NBTTagList();
++        int min = Math.min(list.size(), 20);
++        for (int i = 0; i < min; ++i) {
++            patterns.add(list.get(i));
++        }
++        return patterns;
++    }
++    // Blossom end
++
+     public void b(NBTTagCompound nbttagcompound) {
+         super.b(nbttagcompound);
+         a(nbttagcompound, this.color, this.patterns);
+@@ -58,12 +66,7 @@ public class TileEntityBanner extends TileEntity {
+     public void a(NBTTagCompound nbttagcompound) {
+         super.a(nbttagcompound);
+         this.color = nbttagcompound.getInt("Base");
+-        this.patterns = nbttagcompound.getList("Patterns", 10);
+-        // CraftBukkit start
+-        while (this.patterns.size() > 20) {
+-            this.patterns.a(20); // PAIL Rename remove
+-        }
+-        // CraftBukkit end
++        this.patterns = loadPatternsFromCompound(nbttagcompound); // Blossom - avoid o(n^2) removal of unnecessary patterns
+         this.h = null;
+         this.i = null;
+         this.j = null;
 diff --git a/src/main/java/net/minecraft/server/TileEntitySkull.java b/src/main/java/net/minecraft/server/TileEntitySkull.java
 index 58014c5f1..51b7cc90a 100644
 --- a/src/main/java/net/minecraft/server/TileEntitySkull.java