PaperMC/Remapped-Spigot-Server-Patches/0068-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 3c707ca6b56e89b671db6316d4db90a2903f33b4..a326e5b4ac055f2f8a95c6eaccd8d0a97762da1f 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -699,7 +699,13 @@ public abstract class LivingEntity extends Entity {
 
     @Override
     public void readAdditionalSaveData(CompoundTag tag) {
-        this.setAbsorptionAmount(tag.getFloat("AbsorptionAmount"));
+        // Paper start - jvm keeps optimizing the setter
+        float absorptionAmount = tag.getFloat("AbsorptionAmount");
+        if (Float.isNaN(absorptionAmount)) {
+            absorptionAmount = 0;
+        }
+        this.setAbsorptionAmount(absorptionAmount);
+        // Paper end
         if (tag.contains("Attributes", 9) && this.level != null && !this.level.isClientSide) {
             this.getAttributes().load(tag.getList("Attributes", 10));
         }
@@ -1148,6 +1154,10 @@ 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();
@@ -3042,7 +3052,7 @@ 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 dd29038778d73fae84df360515f3c670915f1d48..b7d5a718375083a4162df4bb41de3acd57b297fb 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -1678,6 +1678,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     }
 
     public void setRealHealth(double health) {
+        if (Double.isNaN(health)) {return;} // Paper
         this.health = health;
     }