Core/SAI: Fix crash in SmartScript

Fix crash in SmartScript storing WorldObject* instead of guid as targets in SmartScript::mTargetStorage , used by SMART_TARGET_STORED target type , SMART_ESCORT_TARGETS and other escort related code.
Fixes #11228 , #10157 .

Valgrind log:
 Invalid read of size 4
  at : Object::GetTypeId() const (Object.h:140)
  by : SmartScript::IsPlayer(WorldObject*) (SmartScript.h:73)
  by : SmartScript::ProcessAction(SmartScriptHolder&, Unit*, unsigned int, unsigned int, bool, SpellInfo const*, GameObject*) (SmartScript.cpp:330)
  by : SmartScript::ProcessEvent(SmartScriptHolder&, Unit*, unsigned int, unsigned int, bool, SpellInfo const*, GameObject*) (SmartScript.cpp:2662)
  by : SmartScript::ProcessAction(SmartScriptHolder&, Unit*, unsigned int, unsigned int, bool, SpellInfo const*, GameObject*) (SmartScript.cpp:2226)
  by : SmartScript::ProcessTimedAction(SmartScriptHolder&, unsigned int const&, unsigned int const&, Unit*, unsigned int, unsigned int, bool, SpellInfo const*, GameObject*) (SmartScript.cpp:2238)
  by : SmartScript::ProcessEvent(SmartScriptHolder&, Unit*, unsigned int, unsigned int, bool, SpellInfo const*, GameObject*) (SmartScript.cpp:2685)
  by : SmartScript::UpdateTimer(SmartScriptHolder&, unsigned int) (SmartScript.cpp:3198)
  by : SmartScript::OnUpdate(unsigned int) (SmartScript.cpp:3244)
  by : SmartAI::UpdateAI(unsigned int) (SmartAI.cpp:331)
  by : Creature::Update(unsigned int) (Creature.cpp:544)
  by : void Trinity::ObjectUpdater::Visit<Creature>(GridRefManager<Creature>&) (GridNotifiers.cpp:340)

3 files changed, 57 insertions, 5 deletions

diff --git a/src/server/game/AI/SmartScripts/SmartScript.cpp b/src/server/game/AI/SmartScripts/SmartScript.cpp
index 5efab2214b6..bd51fe0a85b 100644
--- a/src/server/game/AI/SmartScripts/SmartScript.cpp
+++ b/src/server/game/AI/SmartScripts/SmartScript.cpp
@@ -2551,7 +2551,10 @@ ObjectList* SmartScript::GetTargets(SmartScriptHolder const& e, Unit* invoker /*
         {
             ObjectListMap::iterator itr = mTargetStorage->find(e.target.stored.id);
             if (itr != mTargetStorage->end())
-                l->assign(itr->second->begin(), itr->second->end());
+            {
+                ObjectList* objectList = itr->second->GetObjectList();
+                l->assign(objectList->begin(), objectList->end());
+            }
 
             return l;
         }
diff --git a/src/server/game/AI/SmartScripts/SmartScript.h b/src/server/game/AI/SmartScripts/SmartScript.h
index 56b3674bd73..2e1068d1bff 100644
--- a/src/server/game/AI/SmartScripts/SmartScript.h
+++ b/src/server/game/AI/SmartScripts/SmartScript.h
@@ -99,13 +99,13 @@ class SmartScript
             if (mTargetStorage->find(id) != mTargetStorage->end())
             {
                 // check if already stored
-                if ((*mTargetStorage)[id] == targets)
+                if ((*mTargetStorage)[id]->Equals(targets))
                     return;
 
                 delete (*mTargetStorage)[id];
             }
 
-            (*mTargetStorage)[id] = targets;
+            (*mTargetStorage)[id] = new ObjectGuidList(targets, GetBaseObject());
         }
 
         bool IsSmart(Creature* c = NULL)
@@ -141,7 +141,7 @@ class SmartScript
         {
             ObjectListMap::iterator itr = mTargetStorage->find(id);
             if (itr != mTargetStorage->end())
-                return (*itr).second;
+                return (*itr).second->GetObjectList();
             return NULL;
         }
 
diff --git a/src/server/game/AI/SmartScripts/SmartScriptMgr.h b/src/server/game/AI/SmartScripts/SmartScriptMgr.h
index be074c2939f..08ef71771e5 100644
--- a/src/server/game/AI/SmartScripts/SmartScriptMgr.h
+++ b/src/server/game/AI/SmartScripts/SmartScriptMgr.h
@@ -1321,7 +1321,56 @@ struct SmartScriptHolder
 typedef UNORDERED_MAP<uint32, WayPoint*> WPPath;
 
 typedef std::list<WorldObject*> ObjectList;
-typedef UNORDERED_MAP<uint32, ObjectList*> ObjectListMap;
+typedef std::list<uint64> GuidList;
+class ObjectGuidList
+{
+    ObjectList* m_objectList;
+    GuidList* m_guidList;
+    WorldObject* m_baseObject;
+
+public:
+    ObjectGuidList(ObjectList* objectList, WorldObject* baseObject)
+    {
+        ASSERT(objectList != NULL);
+        ASSERT(baseObject != NULL);
+        m_objectList = objectList;
+        m_baseObject = baseObject;
+        m_guidList = new GuidList();
+
+        for (ObjectList::iterator itr = objectList->begin(); itr != objectList->end(); ++itr)
+        {
+            m_guidList->push_back((*itr)->GetGUID());
+        }
+    }
+
+    ObjectList* GetObjectList()
+    {
+        //sanitize list using m_guidList
+        m_objectList->clear();
+
+        for (GuidList::iterator itr = m_guidList->begin(); itr != m_guidList->end(); ++itr)
+        {
+            if (WorldObject* obj = ObjectAccessor::GetWorldObject(*m_baseObject, *itr))
+                m_objectList->push_back(obj);
+            else
+                TC_LOG_DEBUG("scripts.ai", "SmartScript::mTargetStorage stores a guid to an invalid object: " UI64FMTD, *itr);
+        }
+
+        return m_objectList;
+    }
+
+    bool Equals(ObjectList* objectList)
+    {
+        return m_objectList == objectList;
+    }
+
+    ~ObjectGuidList()
+    {
+        delete m_objectList;
+        delete m_guidList;
+    }
+};
+typedef UNORDERED_MAP<uint32, ObjectGuidList*> ObjectListMap;
 
 class SmartWaypointMgr
 {