Fixed sprinting while breaking a painting edge case. Fixes BUKKIT-740

src/main/java/net/minecraft/server/EntityPainting.java

@@ -286,11 +286,14 @@ public class EntityPainting extends Entity {
     }
 
     public void b_(double d0, double d1, double d2) {
-        if (!this.world.isStatic && d0 * d0 + d1 * d1 + d2 * d2 > 0.0D) {
+        // CraftBukkit start - not needed for paintings
+        /* if (!this.world.isStatic && d0 * d0 + d1 * d1 + d2 * d2 > 0.0D) {
             if (dead) return; // CraftBukkit
 
             this.die();
             this.world.addEntity(new EntityItem(this.world, this.locX, this.locY, this.locZ, new ItemStack(Item.PAINTING)));
+        }*/
+        // CraftBukkit end
     }
-    }
+
 }

src/main/java/net/minecraft/server/NetServerHandler.java

@@ -244,6 +244,13 @@ public class NetServerHandler extends NetHandler implements ICommandListener {
                     }
 
                     if (packet10flying.hasPos && packet10flying.y == -999.0D && packet10flying.stance == -999.0D) {
+                        // CraftBukkit start
+                        if (packet10flying.x > 1 || packet10flying.z > 1) {
+                            System.err.println(player.getName() + " was caught trying to crash the server with an invalid position.");
+                            player.kickPlayer("Nope!");
+                            return;
+                        }
+                        // CraftBukkit end
                         d5 = packet10flying.x;
                         d4 = packet10flying.z;
                     }