Fix exploit for negative itemId's in PetExcludeItemsHandler

src/main/java/net/server/channel/handlers/PetExcludeItemsHandler.java

@@ -21,37 +21,43 @@
 */
 package net.server.channel.handlers;
 
-import client.MapleClient;
 import client.MapleCharacter;
+import client.MapleClient;
+import client.autoban.AutobanFactory;
 import client.inventory.MaplePet;
 import net.AbstractMaplePacketHandler;
 import tools.data.input.SeekableLittleEndianAccessor;
-//import tools.MaplePacketCreator;
 
 /**
  * @author BubblesDev
  * @author Ronan
  */
 public final class PetExcludeItemsHandler extends AbstractMaplePacketHandler {
-    
+
     @Override
     public final void handlePacket(SeekableLittleEndianAccessor slea, MapleClient c) {
         final int petId = slea.readInt();
-        slea.skip(4);
-        
+        slea.skip(4); // timestamp
+
         MapleCharacter chr = c.getPlayer();
-        byte petIndex = (byte)chr.getPetIndex(petId);
+        byte petIndex = chr.getPetIndex(petId);
         if (petIndex < 0) return;
-        
+
         final MaplePet pet = chr.getPet(petIndex);
         if (pet == null) {
             return;
         }
-        
+
         chr.resetExcluded(petId);
         byte amount = slea.readByte();
         for (int i = 0; i < amount; i++) {
-            chr.addExcluded(petId, slea.readInt());
+            int itemId = slea.readInt();
+            if (itemId >= 0) {
+                chr.addExcluded(petId, itemId);
+            } else {
+                AutobanFactory.PACKET_EDIT.alert(chr, "negative item id value in PetExcludeItemsHandler (" + itemId + ")");
+                return;
+            }
         }
         chr.commitExcludedItems();
     }