From d4f12cff52af6917131cd122eb4b653dace16c06 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/server/EntityLiving.java b/src/main/java/net/minecraft/server/EntityLiving.java
index 14097275c8..bdbd899960 100644
--- a/src/main/java/net/minecraft/server/EntityLiving.java
+++ b/src/main/java/net/minecraft/server/EntityLiving.java
@@ -496,7 +496,13 @@ public abstract class EntityLiving extends Entity {
 
     @Override
     public void a(NBTTagCompound nbttagcompound) {
-        this.setAbsorptionHearts(nbttagcompound.getFloat("AbsorptionAmount"));
+        // Paper start - jvm keeps optimizing the setter
+        float absorptionAmount = nbttagcompound.getFloat("AbsorptionAmount");
+        if (Float.isNaN(absorptionAmount)) {
+            absorptionAmount = 0;
+        }
+        this.setAbsorptionHearts(absorptionAmount);
+        // Paper end
         if (nbttagcompound.hasKeyOfType("Attributes", 9) && this.world != null && !this.world.isClientSide) {
             GenericAttributes.a(this.getAttributeMap(), nbttagcompound.getList("Attributes", 10));
         }
@@ -943,6 +949,10 @@ public abstract class EntityLiving extends Entity {
     }
 
     public void setHealth(float f) {
+        // Paper start
+        if (Float.isNaN(f)) { f = getMaxHealth(); if (this.valid) {
+            System.err.println("[NAN-HEALTH] " + getName() + " had NaN health set");
+        } } // Paper end
         // CraftBukkit start - Handle scaled health
         if (this instanceof EntityPlayer) {
             org.bukkit.craftbukkit.entity.CraftPlayer player = ((EntityPlayer) this).getBukkitEntity();
@@ -2737,7 +2747,7 @@ public abstract class EntityLiving extends Entity {
     }
 
     public void setAbsorptionHearts(float f) {
-        if (f < 0.0F) {
+        if (f < 0.0F || Float.isNaN(f)) { // Paper
             f = 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 6ff6d646a5..a874b328ce 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -1563,6 +1563,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     }
 
     public void setRealHealth(double health) {
+        if (Double.isNaN(health)) {return;} // Paper
         this.health = health;
     }
 
-- 
2.24.1