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 76da306041b61f6c93e6f58f580054af7dfc234e..2277b06e3e13a1abb469064d5b23495a464fd7c0 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -759,7 +759,13 @@ public abstract class LivingEntity extends Entity {
 
     @Override
     public void readAdditionalSaveData(CompoundTag nbt) {
-        this.setAbsorptionAmount(nbt.getFloat("AbsorptionAmount"));
+        // Paper start - jvm keeps optimizing the setter
+        float absorptionAmount = nbt.getFloat("AbsorptionAmount");
+        if (Float.isNaN(absorptionAmount)) {
+            absorptionAmount = 0;
+        }
+        this.setAbsorptionAmount(absorptionAmount);
+        // Paper end
         if (nbt.contains("Attributes", 9) && this.level != null && !this.level.isClientSide) {
             this.getAttributes().load(nbt.getList("Attributes", 10));
         }
@@ -1246,6 +1252,10 @@ public abstract class LivingEntity extends Entity {
     }
 
     public void setHealth(float health) {
+        // Paper start
+        if (Float.isNaN(health)) { health = getMaxHealth(); if (this.valid) {
+            System.err.println("[NAN-HEALTH] " + getScoreboardName() + " had NaN health set");
+        } } // Paper end
         // CraftBukkit start - Handle scaled health
         if (this instanceof ServerPlayer) {
             org.bukkit.craftbukkit.entity.CraftPlayer player = ((ServerPlayer) this).getBukkitEntity();
@@ -3398,7 +3408,7 @@ public abstract class LivingEntity extends Entity {
     }
 
     public void setAbsorptionAmount(float amount) {
-        if (amount < 0.0F) {
+        if (amount < 0.0F || Float.isNaN(amount)) { // Paper
             amount = 0.0F;
         }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index 21df67c4b78947868407d96cd91a3ce0fd1dc927..885d5dd984f2d7d8d662d6b6546eacd0879a2e54 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -1746,6 +1746,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     }
 
     public void setRealHealth(double health) {
+        if (Double.isNaN(health)) {return;} // Paper
         this.health = health;
     }