Core/Movement: Fixed possible invalid memory access

src/server/game/Entities/Creature/Creature.cpp

@@ -726,16 +726,16 @@ bool Creature::AIM_Initialize(CreatureAI* ai)
 void Creature::Motion_Initialize()
 {
     if (!m_formation)
-        i_motionMaster.Initialize();
+        GetMotionMaster()->Initialize();
     else if (m_formation->getLeader() == this)
     {
         m_formation->FormationReset(false);
-        i_motionMaster.Initialize();
+        GetMotionMaster()->Initialize();
     }
     else if (m_formation->isFormed())
-        i_motionMaster.MoveIdle(); //wait the order of leader
+        GetMotionMaster()->MoveIdle(); //wait the order of leader
     else
-        i_motionMaster.Initialize();
+        GetMotionMaster()->Initialize();
 }
 
 bool Creature::Create(uint32 guidlow, Map* map, uint32 phaseMask, uint32 Entry, uint32 vehId, uint32 team, float x, float y, float z, float ang, const CreatureData* data)
@@ -1461,7 +1461,7 @@ void Creature::setDeathState(DeathState s)
             m_formation->FormationReset(true);
 
         if ((CanFly() || IsFlying()))
-            i_motionMaster.MoveFall();
+            GetMotionMaster()->MoveFall();
 
         Unit::setDeathState(CORPSE);
     }

src/server/game/Entities/Player/Player.cpp

@@ -5197,7 +5197,7 @@ void Player::ResurrectPlayer(float restore_percent, bool applySickness)
 void Player::KillPlayer()
 {
     if (IsFlying() && !GetTransport())
-        i_motionMaster.MoveFall();
+        GetMotionMaster()->MoveFall();
 
     SetMovement(MOVE_ROOT);
 

src/server/game/Entities/Unit/Unit.cpp

@@ -165,7 +165,7 @@ Unit::Unit(bool isWorldObject) :
     IsAIEnabled(false), NeedChangeAI(false), LastCharmerGUID(0),
     m_ControlledByPlayer(false), movespline(new Movement::MoveSpline()),
     i_AI(NULL), i_disabledAI(NULL), m_AutoRepeatFirstCast(false), m_procDeep(0),
-    m_removedAurasCount(0), i_motionMaster(this), m_ThreatManager(this),
+    m_removedAurasCount(0), i_motionMaster(new MotionMaster(this)), m_ThreatManager(this),
     m_vehicle(NULL), m_vehicleKit(NULL), m_unitTypeMask(UNIT_MASK_NONE),
     m_HostileRefManager(this), _lastDamagedTime(0)
 {
@@ -293,6 +293,7 @@ Unit::~Unit()
 
     _DeleteRemovedAuras();
 
+    delete i_motionMaster;
     delete m_charmInfo;
     delete movespline;
 
@@ -362,7 +363,7 @@ void Unit::Update(uint32 p_time)
     }
 
     UpdateSplineMovement(p_time);
-    i_motionMaster.UpdateMotion(p_time);
+    i_motionMaster->UpdateMotion(p_time);
 }
 
 bool Unit::haveOffhandWeapon() const

src/server/game/Entities/Unit/Unit.h

@@ -2005,8 +2005,8 @@ class Unit : public WorldObject
         static Player* GetPlayer(WorldObject& object, uint64 guid);
         static Creature* GetCreature(WorldObject& object, uint64 guid);
 
-        MotionMaster* GetMotionMaster() { return &i_motionMaster; }
-        const MotionMaster* GetMotionMaster() const { return &i_motionMaster; }
+        MotionMaster* GetMotionMaster() { return i_motionMaster; }
+        const MotionMaster* GetMotionMaster() const { return i_motionMaster; }
 
         bool IsStopped() const { return !(HasUnitState(UNIT_STATE_MOVING)); }
         void StopMoving();
@@ -2187,7 +2187,7 @@ class Unit : public WorldObject
 
         virtual SpellSchoolMask GetMeleeDamageSchoolMask() const;
 
-        MotionMaster i_motionMaster;
+        MotionMaster* i_motionMaster;
 
         uint32 m_reactiveTimer[MAX_REACTIVE];
         uint32 m_regenTimer;

src/server/game/Movement/MotionMaster.cpp

@@ -72,7 +72,8 @@ MotionMaster::~MotionMaster()
     {
         MovementGenerator *curr = top();
         pop();
-        if (curr) DirectDelete(curr);
+        if (curr && !isStatic(curr))
+            delete curr;    // Skip finalizing on delete, it might launch new movement
     }
 }