PaperMC/patches/server/0076-handle-NaN-health-absorb-values-and-repair-bad-data.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 27 Sep 2015 01:18:02 -0400
Subject: [PATCH] handle NaN health/absorb values and repair bad data


diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index d710e20447df4767e10f9250ce91dcd3141eaab0..e1d34c666f88bdbead59aff0d349a49608a7b8cd 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -833,7 +833,13 @@ public abstract class LivingEntity extends Entity implements Attackable {
 
     @Override
     public void readAdditionalSaveData(CompoundTag nbt) {
-        this.internalSetAbsorptionAmount(nbt.getFloat("AbsorptionAmount"));
+        // Paper start - Check for NaN
+        float absorptionAmount = nbt.getFloat("AbsorptionAmount");
+        if (Float.isNaN(absorptionAmount)) {
+            absorptionAmount = 0;
+        }
+        this.internalSetAbsorptionAmount(absorptionAmount);
+        // Paper end - Check for NaN
         if (nbt.contains("Attributes", 9) && this.level() != null && !this.level().isClientSide) {
             this.getAttributes().load(nbt.getList("Attributes", 10));
         }
@@ -1365,6 +1371,10 @@ public abstract class LivingEntity extends Entity implements Attackable {
     }
 
     public void setHealth(float health) {
+        // Paper start - Check for NaN
+        if (Float.isNaN(health)) { health = getMaxHealth(); if (this.valid) {
+            System.err.println("[NAN-HEALTH] " + getScoreboardName() + " had NaN health set");
+        } } // Paper end - Check for NaN
         // CraftBukkit start - Handle scaled health
         if (this instanceof ServerPlayer) {
             org.bukkit.craftbukkit.entity.CraftPlayer player = ((ServerPlayer) this).getBukkitEntity();
@@ -3643,7 +3653,7 @@ public abstract class LivingEntity extends Entity implements Attackable {
     }
 
     public final void setAbsorptionAmount(float absorptionAmount) {
-        this.internalSetAbsorptionAmount(Mth.clamp(absorptionAmount, 0.0F, this.getMaxAbsorption()));
+        this.internalSetAbsorptionAmount(!Float.isNaN(absorptionAmount) ? Mth.clamp(absorptionAmount, 0.0F, this.getMaxAbsorption()) : 0.0F); // Paper - Check for NaN
     }
 
     protected void internalSetAbsorptionAmount(float absorptionAmount) {
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index 155f7053504874758d8d25a21f0ac613f81ca7d1..4923e6bba9eb95c3e7f6fafef63961cec091e1f8 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -2324,6 +2324,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     }
 
     public void setRealHealth(double health) {
+        if (Double.isNaN(health)) {return;} // Paper - Check for NaN
         this.health = health;
     }