PaperMC/patches/unapplied/server/0905-Do-not-accept-invalid-client-settings.patch

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 1169149f0316e683ba5ac3b1e95a8a00a3c2dafa..0b7923f67d27549f41c0d398d1b99737f0c8a746 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -3170,6 +3170,13 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
     @Override
     public void handleClientInformation(ServerboundClientInformationPacket packet) {
         PacketUtils.ensureRunningOnSameThread(packet, this, this.player.getLevel());
+        // 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);
     }