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27 lines
1.8 KiB
Diff
27 lines
1.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sat, 2 May 2020 03:09:46 -0400
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Subject: [PATCH] Validate PickItem Packet and kick for invalid
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diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
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index 13b4bab38203eccf09d805c441615f61bc796190..76df4bdf8831f993d52bb6561ff5e05c774811e7 100644
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--- a/src/main/java/net/minecraft/server/PlayerConnection.java
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+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
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@@ -689,7 +689,14 @@ public class PlayerConnection implements PacketListenerPlayIn {
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@Override
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public void a(PacketPlayInPickItem packetplayinpickitem) {
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PlayerConnectionUtils.ensureMainThread(packetplayinpickitem, this, this.player.getWorldServer());
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- this.player.inventory.c(packetplayinpickitem.b());
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+ // Paper start - validate pick item position
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+ if (!(packetplayinpickitem.b() >= 0 && packetplayinpickitem.b() < this.player.inventory.items.size())) {
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+ PlayerConnection.LOGGER.warn("{} tried to set an invalid carried item", this.player.getDisplayName().getString());
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+ this.disconnect("Invalid hotbar selection (Hacking?)");
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+ return;
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+ }
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+ this.player.inventory.c(packetplayinpickitem.b()); // Paper - Diff above if changed
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+ // Paper end
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this.player.playerConnection.sendPacket(new PacketPlayOutSetSlot(-2, this.player.inventory.itemInHandIndex, this.player.inventory.getItem(this.player.inventory.itemInHandIndex)));
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this.player.playerConnection.sendPacket(new PacketPlayOutSetSlot(-2, packetplayinpickitem.b(), this.player.inventory.getItem(packetplayinpickitem.b())));
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this.player.playerConnection.sendPacket(new PacketPlayOutHeldItemSlot(this.player.inventory.itemInHandIndex));
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