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89d51d5f29
Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable. It should be noted that this decision does not promise all future exploits will be configurable.
35 lines
2 KiB
Diff
35 lines
2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Andrew Steinborn <git@steinborn.me>
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Date: Sun, 5 Jul 2020 22:38:18 -0400
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Subject: [PATCH] Optimize NetworkManager Exception Handling
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diff --git a/src/main/java/net/minecraft/network/ConnectionProtocol.java b/src/main/java/net/minecraft/network/ConnectionProtocol.java
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index ac1aa37329bd4d411964ea34ea8147f6db945b9a..0ed8d5691a5562a944b68f385b97ef814c2380e1 100644
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--- a/src/main/java/net/minecraft/network/ConnectionProtocol.java
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+++ b/src/main/java/net/minecraft/network/ConnectionProtocol.java
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@@ -341,6 +341,7 @@ public enum ConnectionProtocol {
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@Nullable
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public Packet<?> createPacket(int id, FriendlyByteBuf buf) {
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+ if (id < 0 || id >= this.idToDeserializer.size()) return null; // Paper - Perf: Optimize exception handling
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Function<FriendlyByteBuf, ? extends Packet<? super T>> function = this.idToDeserializer.get(id);
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return function != null ? function.apply(buf) : null;
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}
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diff --git a/src/main/java/net/minecraft/network/Varint21FrameDecoder.java b/src/main/java/net/minecraft/network/Varint21FrameDecoder.java
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index 00c170a16a57f41f881c6b282cba474ce485b34c..137b9a088c82ce6813bf8a80468675bb4992ce53 100644
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--- a/src/main/java/net/minecraft/network/Varint21FrameDecoder.java
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+++ b/src/main/java/net/minecraft/network/Varint21FrameDecoder.java
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@@ -39,6 +39,12 @@ public class Varint21FrameDecoder extends ByteToMessageDecoder {
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}
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protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list) {
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+ // Paper start - Perf: Optimize exception handling; if channel is not active just discard the packet
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+ if (!channelHandlerContext.channel().isActive()) {
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+ byteBuf.skipBytes(byteBuf.readableBytes());
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+ return;
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+ }
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+ // Paper end - Perf: Optimize exception handling
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byteBuf.markReaderIndex();
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this.helperBuf.clear();
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if (!copyVarint(byteBuf, this.helperBuf)) {
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