1 files changed, 24 insertions, 0 deletions
diff --git a/patches/server/0809-Do-not-accept-invalid-client-settings.patch b/patches/server/0809-Do-not-accept-invalid-client-settings.patch
new file mode 100644
index 0000000000..81f2f884ae
--- /dev/null
+++ b/patches/server/0809-Do-not-accept-invalid-client-settings.patch
@@ -0,0 +1,24 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <[email protected]>
+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 b5a20f69f0df93e3786f9b27b17a2b0ab7c69a91..3017a4509cf112578b96dce9bd517256313ebcb8 100644
+--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
++++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+@@ -3311,6 +3311,13 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
+     @Override
+     public void handleClientInformation(ServerboundClientInformationPacket packet) {
+         PacketUtils.ensureRunningOnSameThread(packet, this, this.player.serverLevel());
++        // Paper start - do not accept invalid information
++        if (packet.information().viewDistance() < 0) {
++            LOGGER.warn("Disconnecting " + this.player.getScoreboardName() + " for invalid view distance: " + packet.information().viewDistance());
++            this.disconnect("Invalid client settings", org.bukkit.event.player.PlayerKickEvent.Cause.ILLEGAL_ACTION);
++            return;
++        }
++        // Paper end - do not accept invalid information
+         this.player.updateOptions(packet.information());
+         this.connection.channel.attr(io.papermc.paper.adventure.PaperAdventure.LOCALE_ATTRIBUTE).set(net.kyori.adventure.translation.Translator.parseLocale(packet.information().language())); // Paper
+     }