Core/Misc: Fix a crash in CalendarMgr::AddAction and initialize some wild pointers.

src/server/game/Calendar/CalendarMgr.cpp

@@ -375,7 +375,7 @@ void CalendarMgr::AddAction(CalendarAction const& action)
             uint64 eventId = action.Invite.GetEventId();
             uint64 inviteId = action.Invite.GetInviteId();
 
-            CalendarEvent* calendarEvent;
+            CalendarEvent* calendarEvent = NULL;
             if (action.GetInviteId() != action.Invite.GetInviteId())
                 calendarEvent = CheckPermisions(eventId, action.GetPlayer(), action.GetInviteId(), CALENDAR_RANK_MODERATOR);
             else
@@ -395,7 +395,7 @@ void CalendarMgr::AddAction(CalendarAction const& action)
             uint64 eventId = action.Invite.GetEventId();
             uint64 inviteId = action.Invite.GetInviteId();
 
-            CalendarEvent* calendarEvent;
+            CalendarEvent* calendarEvent = NULL;
             if (action.GetInviteId() != action.Invite.GetInviteId())
                 calendarEvent = CheckPermisions(eventId, action.GetPlayer(), action.GetInviteId(), CALENDAR_RANK_OWNER);
             else
@@ -420,6 +420,9 @@ void CalendarMgr::AddAction(CalendarAction const& action)
 
             // already checked in CheckPermisions
             CalendarInvite* invite = GetInvite(inviteId);
+            if (!invite)
+                return;
+
             if (calendarEvent->GetCreatorGUID() == invite->GetInvitee())
             {
                 action.GetPlayer()->GetSession()->SendCalendarCommandResult(CALENDAR_ERROR_DELETE_CREATOR_FAILED);

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

@@ -784,20 +784,9 @@ uint32 Unit::DealDamage(Unit* victim, uint32 damage, CleanDamage const* cleanDam
         // last damage from duel opponent
         if (duel_hasEnded)
         {
-            Player* he;
+            Player* he = duel_wasMounted ? victim->GetCharmer()->ToPlayer() : victim->ToPlayer();
 
-            if (duel_wasMounted)
+            ASSERT(he && he->duel);
-            {
-                ASSERT(victim->GetCharmer()->GetTypeId() == TYPEID_PLAYER);
-                he = victim->GetCharmer()->ToPlayer();
-            }
-            else
-            {
-                ASSERT(victim->GetTypeId() == TYPEID_PLAYER);
-                he = victim->ToPlayer();
-            }
-
-            ASSERT(he->duel);
 
             if (duel_wasMounted) // In this case victim==mount
                 victim->SetHealth(1);

src/server/game/Maps/MapInstanced.cpp

@@ -116,19 +116,21 @@ Map* MapInstanced::CreateInstanceForPlayer(const uint32 mapId, Player* player)
         return NULL;
 
     Map* map = NULL;
-    uint32 NewInstanceId = 0;                       // instanceId of the resulting map
+    uint32 newInstanceId = 0;                       // instanceId of the resulting map
 
     if (IsBattlegroundOrArena())
     {
         // instantiate or find existing bg map for player
         // the instance id is set in battlegroundid
-        NewInstanceId = player->GetBattlegroundId();
+        newInstanceId = player->GetBattlegroundId();
-        if (!NewInstanceId) return NULL;
+        if (!newInstanceId)
-        map = sMapMgr->FindMap(mapId, NewInstanceId);
+            return NULL;
+
+        map = sMapMgr->FindMap(mapId, newInstanceId);
         if (!map)
         {
             if (Battleground* bg = player->GetBattleground())
-                map = CreateBattleground(NewInstanceId, bg);
+                map = CreateBattleground(newInstanceId, bg);
             else
             {
                 player->TeleportToBGEntryPoint();
@@ -158,24 +160,24 @@ Map* MapInstanced::CreateInstanceForPlayer(const uint32 mapId, Player* player)
         if (pSave)
         {
             // solo/perm/group
-            NewInstanceId = pSave->GetInstanceId();
+            newInstanceId = pSave->GetInstanceId();
-            map = FindInstanceMap(NewInstanceId);
+            map = FindInstanceMap(newInstanceId);
             // it is possible that the save exists but the map doesn't
             if (!map)
-                map = CreateInstance(NewInstanceId, pSave, pSave->GetDifficulty());
+                map = CreateInstance(newInstanceId, pSave, pSave->GetDifficulty());
         }
         else
         {
             // if no instanceId via group members or instance saves is found
             // the instance will be created for the first time
-            NewInstanceId = sMapMgr->GenerateInstanceId();
+            newInstanceId = sMapMgr->GenerateInstanceId();
 
             Difficulty diff = player->GetGroup() ? player->GetGroup()->GetDifficulty(IsRaid()) : player->GetDifficulty(IsRaid());
             //Seems it is now possible, but I do not know if it should be allowed
             //ASSERT(!FindInstanceMap(NewInstanceId));
-            map = FindInstanceMap(NewInstanceId);
+            map = FindInstanceMap(newInstanceId);
             if (!map)
-                map = CreateInstance(NewInstanceId, NULL, diff);
+                map = CreateInstance(newInstanceId, NULL, diff);
         }
     }