Merge commit 'c87de730fae0914a5d0741365066007a46f9a469' into 4.3.4

src/server/game/Handlers/QuestHandler.cpp

@@ -467,6 +467,12 @@ void WorldSession::HandleQuestConfirmAccept(WorldPacket& recvData)
         if (!_player->IsInSameRaidWith(originalPlayer))
             return;
 
+        if (!originalPlayer->CanShareQuest(questId))
+            return;
+
+        if (!_player->CanTakeQuest(quest, true))
+            return;
+
         if (_player->CanAddQuest(quest, true))
             _player->AddQuestAndCheckCompletion(quest, NULL); // NULL, this prevent DB script from duplicate running