From be41c59b3d676632710f10a1c88d655e12cbf48c Mon Sep 17 00:00:00 2001
From: linsaftw <linsaftw@users.noreply.github.com>
Date: Sat, 20 Mar 2021 12:36:25 -0300
Subject: [PATCH] Fix ByteBuf memory leaks


diff --git a/proxy/src/main/java/net/md_5/bungee/ServerConnector.java b/proxy/src/main/java/net/md_5/bungee/ServerConnector.java
index 522bd93da..494375cd6 100644
--- a/proxy/src/main/java/net/md_5/bungee/ServerConnector.java
+++ b/proxy/src/main/java/net/md_5/bungee/ServerConnector.java
@@ -284,9 +284,15 @@ public class ServerConnector extends PacketHandler
                 } else
                 {
                     ByteBuf brand = ByteBufAllocator.DEFAULT.heapBuffer();
-                    DefinedPacket.writeString(brandString, brand);
-                    user.unsafe().sendPacket( new PluginMessage( user.getPendingConnection().getVersion() >= ProtocolConstants.MINECRAFT_1_13 ? "minecraft:brand" : "MC|Brand", brand, handshakeHandler.isServerForge() ) );
-                    brand.release();
+
+                    try
+                    {
+                        DefinedPacket.writeString(brandString, brand);
+                        user.unsafe().sendPacket( new PluginMessage( user.getPendingConnection().getVersion() >= ProtocolConstants.MINECRAFT_1_13 ? "minecraft:brand" : "MC|Brand", brand, handshakeHandler.isServerForge() ) );
+                    } finally
+                    {
+                        brand.release();
+                    }
                 }
                 // Travertine end
             }
diff --git a/proxy/src/main/java/net/md_5/bungee/connection/DownstreamBridge.java b/proxy/src/main/java/net/md_5/bungee/connection/DownstreamBridge.java
index 474551d3e..8716d0c85 100644
--- a/proxy/src/main/java/net/md_5/bungee/connection/DownstreamBridge.java
+++ b/proxy/src/main/java/net/md_5/bungee/connection/DownstreamBridge.java
@@ -294,12 +294,21 @@ public class DownstreamBridge extends PacketHandler
                 try
                 {
                     ByteBuf brand = Unpooled.wrappedBuffer(pluginMessage.getData());
-                    String serverBrand = DefinedPacket.readString(brand);
-                    brand.release();
-                    brand = ByteBufAllocator.DEFAULT.heapBuffer();
-                    DefinedPacket.writeString(bungee.getName() + " <- " + serverBrand, brand ); // Waterfall
-                    pluginMessage.setData(brand);
-                    brand.release();
+                    String serverBrand = null;
+
+                    try {
+                        serverBrand = DefinedPacket.readString(brand);
+                    } finally {
+                        brand.release();
+                    }
+
+                    try {
+                        brand = ByteBufAllocator.DEFAULT.heapBuffer();
+                        DefinedPacket.writeString(bungee.getName() + " <- " + serverBrand, brand ); // Waterfall
+                        pluginMessage.setData(brand);
+                    } finally {
+                        brand.release();
+                    }
                 } catch (Exception ProtocolHacksSuck)
                 {
                     return;
diff --git a/proxy/src/main/java/net/md_5/bungee/entitymap/EntityMap.java b/proxy/src/main/java/net/md_5/bungee/entitymap/EntityMap.java
index a3a12e19b..214a1fd04 100644
--- a/proxy/src/main/java/net/md_5/bungee/entitymap/EntityMap.java
+++ b/proxy/src/main/java/net/md_5/bungee/entitymap/EntityMap.java
@@ -143,11 +143,17 @@ public abstract class EntityMap
         if ( readId == oldId || readId == newId )
         {
             ByteBuf data = packet.copy();
-            packet.readerIndex( offset );
-            packet.writerIndex( offset );
-            DefinedPacket.writeVarInt( readId == oldId ? newId : oldId, packet );
-            packet.writeBytes( data );
-            data.release();
+
+            try
+            {
+                packet.readerIndex( offset );
+                packet.writerIndex( offset );
+                DefinedPacket.writeVarInt( readId == oldId ? newId : oldId, packet );
+                packet.writeBytes( data );
+            } finally
+            {
+                data.release();
+            }
         }
     }
 
diff --git a/proxy/src/main/java/net/md_5/bungee/entitymap/EntityMap_1_7_6.java b/proxy/src/main/java/net/md_5/bungee/entitymap/EntityMap_1_7_6.java
index 6755fe845..21871d14a 100644
--- a/proxy/src/main/java/net/md_5/bungee/entitymap/EntityMap_1_7_6.java
+++ b/proxy/src/main/java/net/md_5/bungee/entitymap/EntityMap_1_7_6.java
@@ -39,19 +39,27 @@ class EntityMap_1_7_6 extends EntityMap_1_7_2
                             && profile.getProperties().length >= 1 )
                     {
                         ByteBuf rest = packet.copy();
-                        packet.readerIndex( readerIndex );
-                        packet.writerIndex( readerIndex + packetIdLength + idLength );
-                        DefinedPacket.writeString( player.getUniqueId().toString(), packet );
-                        DefinedPacket.writeString( username, packet );
-                        DefinedPacket.writeVarInt( profile.getProperties().length, packet );
-                        for ( LoginResult.Property property : profile.getProperties() )
+
+                        try
+                        {
+                            packet.readerIndex( readerIndex );
+                            packet.writerIndex( readerIndex + packetIdLength + idLength );
+                            DefinedPacket.writeString( player.getUniqueId().toString(), packet );
+                            DefinedPacket.writeString( username, packet );
+                            DefinedPacket.writeVarInt( profile.getProperties().length, packet );
+
+                            for ( LoginResult.Property property : profile.getProperties() )
+                            {
+                                DefinedPacket.writeString( property.getName(), packet );
+                                DefinedPacket.writeString( property.getValue(), packet );
+                                DefinedPacket.writeString( property.getSignature(), packet );
+                            }
+
+                            packet.writeBytes( rest );
+                        } finally
                         {
-                            DefinedPacket.writeString( property.getName(), packet );
-                            DefinedPacket.writeString( property.getValue(), packet );
-                            DefinedPacket.writeString( property.getSignature(), packet );
+                            rest.release();
                         }
-                        packet.writeBytes( rest );
-                        rest.release();
                     }
                 }
             }
diff --git a/proxy/src/main/java/net/md_5/bungee/forge/ForgeUtils.java b/proxy/src/main/java/net/md_5/bungee/forge/ForgeUtils.java
index cefa0206e..2cd5740ca 100644
--- a/proxy/src/main/java/net/md_5/bungee/forge/ForgeUtils.java
+++ b/proxy/src/main/java/net/md_5/bungee/forge/ForgeUtils.java
@@ -38,15 +38,27 @@ public class ForgeUtils
     {
         Map<String, String> modTags = new HashMap<>();
         ByteBuf payload = Unpooled.wrappedBuffer( pluginMessage.getData() );
-        byte discriminator = payload.readByte();
-        if ( discriminator == 2 ) // ModList
+
+        try
         {
-            ByteBuf buffer = payload.slice();
-            int modCount = DefinedPacket.readVarInt( buffer, 2 );
-            for ( int i = 0; i < modCount; i++ )
+            byte discriminator = payload.readByte();
+            if ( discriminator == 2 ) // ModList
             {
-                modTags.put( DefinedPacket.readString( buffer ), DefinedPacket.readString( buffer ) );
+                ByteBuf buffer = payload.slice();
+
+                try {
+                    int modCount = DefinedPacket.readVarInt( buffer, 2 );
+                    for ( int i = 0; i < modCount; i++ )
+                    {
+                        modTags.put( DefinedPacket.readString( buffer ), DefinedPacket.readString( buffer ) );
+                    }
+                } finally
+                {
+                    buffer.release();
+                }
             }
+        } finally {
+            payload.release();
         }
         return modTags;
     }
-- 
2.31.1