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Paper/patches/server/0826-Do-not-accept-invalid-client-settings.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sat, 7 May 2022 14:58:53 -0700
Subject: [PATCH] Do not accept invalid client settings
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 65b94c6e2d85637342ebfb5478189536759d8338..042dea0c808d21c97f3a26027625474c6440a372 100644
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--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -3453,6 +3453,13 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
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@Override
public void handleClientInformation(ServerboundClientInformationPacket packet) {
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PacketUtils.ensureRunningOnSameThread(packet, this, this.player.serverLevel());
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+ // Paper start - do not accept invalid information
+ if (packet.viewDistance() < 0) {
+ LOGGER.warn("Disconnecting " + this.player.getScoreboardName() + " for invalid view distance: " + packet.viewDistance());
+ this.disconnect("Invalid client settings", PlayerKickEvent.Cause.ILLEGAL_ACTION);
+ return;
+ }
+ // Paper end - do not accept invalid information
this.player.updateOptions(packet);
}