papermc/Spigot-Server-Patches/0111-Prevent-possible-infinite-loop-in-BlockPosition-iter.patch

From 5cf2de3b1381af0c32b0cfd020b12ce6d05d47d6 Mon Sep 17 00:00:00 2001
From: DemonWav <demonwav@gmail.com>
Date: Sat, 26 Mar 2016 21:36:05 -0500
Subject: [PATCH] Prevent possible infinite loop in BlockPosition iterator


diff --git a/src/main/java/net/minecraft/server/BlockPosition.java b/src/main/java/net/minecraft/server/BlockPosition.java
index 2d56f02..b87c4c6 100644
--- a/src/main/java/net/minecraft/server/BlockPosition.java
+++ b/src/main/java/net/minecraft/server/BlockPosition.java
@@ -139,15 +139,17 @@ public class BlockPosition extends BaseBlockPosition {
 
                     protected BlockPosition a() {
                         if (this.b == null) {
-                            this.b = blockposition;
+                            this.b = blockposition2; // Paper - use blockposition2 instead of blockposition to prevent infinite loops
                             return this.b;
-                        } else if (this.b.equals(blockposition1)) {
+                        } else if (this.b.equals(blockposition3)) { // Paper - use blockposition3 instead of blockposition1 to prevent infinite loops
                             return (BlockPosition) this.endOfData();
                         } else {
                             int i = this.b.getX();
                             int j = this.b.getY();
                             int k = this.b.getZ();
 
+                            // Paper start - use blockposition2 and blockposition3 to prevent infinite loops
+                            /*
                             if (i < blockposition1.getX()) {
                                 ++i;
                             } else if (j < blockposition1.getY()) {
@@ -158,6 +160,18 @@ public class BlockPosition extends BaseBlockPosition {
                                 j = blockposition.getY();
                                 ++k;
                             }
+                            */
+                            if (i < blockposition3.getX()) {
+                                ++i;
+                            } else if (j < blockposition3.getY()) {
+                                i = blockposition2.getX();
+                                ++j;
+                            } else if (k < blockposition3.getZ()) {
+                                i = blockposition2.getX();
+                                j = blockposition2.getY();
+                                ++k;
+                            }
+                            // Paper end
 
                             this.b = new BlockPosition(i, j, k);
                             return this.b;
@@ -187,15 +201,17 @@ public class BlockPosition extends BaseBlockPosition {
 
                     protected BlockPosition.MutableBlockPosition a() {
                         if (this.b == null) {
-                            this.b = new BlockPosition.MutableBlockPosition(blockposition.getX(), blockposition.getY(), blockposition.getZ());
+                            this.b = new BlockPosition.MutableBlockPosition(blockposition2.getX(), blockposition2.getY(), blockposition2.getZ()); // Paper - use blockposition2 instead of blockposition to prevent infinite loops
                             return this.b;
-                        } else if (this.b.equals(blockposition1)) {
+                        } else if (this.b.equals(blockposition3)) { // Paper - use blockposition3 instead of blockposition1 to prevent infinite loops
                             return (BlockPosition.MutableBlockPosition) this.endOfData();
                         } else {
                             int i = this.b.getX();
                             int j = this.b.getY();
                             int k = this.b.getZ();
 
+                            // Paper start - use blockposition2 and blockposition3 to prevent infinite loops
+                            /*
                             if (i < blockposition1.getX()) {
                                 ++i;
                             } else if (j < blockposition1.getY()) {
@@ -206,6 +222,18 @@ public class BlockPosition extends BaseBlockPosition {
                                 j = blockposition.getY();
                                 ++k;
                             }
+                            */
+                            if (i < blockposition3.getX()) {
+                                ++i;
+                            } else if (j < blockposition3.getY()) {
+                                i = blockposition2.getX();
+                                ++j;
+                            } else if (k < blockposition3.getZ()) {
+                                i = blockposition2.getX();
+                                j = blockposition2.getY();
+                                ++k;
+                            }
+                            // Paper end
 
                             // Paper start - modify base position variables
                             ((BaseBlockPosition) this.b).a = i;
-- 
2.8.0