Fix possible bug occuring during shuffling of raid subgroups, and prevent client side exploit. Author: Vladimir.

--HG--
branch : trunk

src/server/game/Groups/Group.cpp

@@ -1192,7 +1192,7 @@ bool Group::_addMember(const uint64 &guid, const char* name)
     if (m_subGroupsCounts)
     {
         bool groupFound = false;
-        for (; groupid < MAXRAIDSIZE/MAXGROUPSIZE; ++groupid)
+        for (; groupid < MAX_RAID_SUBGROUPS; ++groupid)
         {
             if (m_subGroupsCounts[groupid] < MAXGROUPSIZE)
             {
@@ -1445,17 +1445,20 @@ void Group::ChangeMembersGroup(const uint64 &guid, const uint8 &group)
 {
     if (!isRaidGroup())
         return;
+
     Player *player = objmgr.GetPlayer(guid);
 
     if (!player)
     {
-        uint8 prevSubGroup;
-        prevSubGroup = GetMemberGroup(guid);
-
-        SubGroupCounterDecrease(prevSubGroup);
+        uint8 prevSubGroup = GetMemberGroup(guid);
+        if (prevSubGroup == group)
+            return;
 
         if (_setMembersGroup(guid, group))
+        {
+            SubGroupCounterDecrease(prevSubGroup);
             SendUpdate();
+        }
     }
     else
         // This methods handles itself groupcounter decrease
@@ -1467,9 +1470,13 @@ void Group::ChangeMembersGroup(Player *player, const uint8 &group)
 {
     if (!player || !isRaidGroup())
         return;
+        
+    uint8 prevSubGroup = player->GetSubGroup();
+    if (prevSubGroup == group)
+        return;
+
     if (_setMembersGroup(player->GetGUID(), group))
     {
-        uint8 prevSubGroup = player->GetSubGroup();
         if (player->GetGroup() == this)
             player->GetGroupRef().setSubGroup(group);
         //if player is in BG raid, it is possible that he is also in normal raid - and that normal raid is stored in m_originalGroup reference

src/server/game/Groups/Group.h

@@ -33,6 +33,7 @@
 
 #define MAXGROUPSIZE 5
 #define MAXRAIDSIZE 40
+#define MAX_RAID_SUBGROUPS MAXRAIDSIZE/MAXGROUPSIZE
 #define TARGETICONCOUNT 8
 
 enum RollVote
@@ -260,7 +261,7 @@ class Group
         {
             member_citerator mslot = _getMemberCSlot(guid);
             if (mslot == m_memberSlots.end())
-                return (MAXRAIDSIZE/MAXGROUPSIZE+1);
+                return (MAX_RAID_SUBGROUPS+1);
 
             return mslot->group;
         }
@@ -381,9 +382,9 @@ class Group
         {
             // Sub group counters initialization
             if (!m_subGroupsCounts)
-                m_subGroupsCounts = new uint8[MAXRAIDSIZE / MAXGROUPSIZE];
+                m_subGroupsCounts = new uint8[MAX_RAID_SUBGROUPS];
 
-            memset((void*)m_subGroupsCounts, 0, (MAXRAIDSIZE / MAXGROUPSIZE)*sizeof(uint8));
+            memset((void*)m_subGroupsCounts, 0, (MAX_RAID_SUBGROUPS)*sizeof(uint8));
 
             for (member_citerator itr = m_memberSlots.begin(); itr != m_memberSlots.end(); ++itr)
                 ++m_subGroupsCounts[itr->group];

src/server/game/Server/Protocol/Handlers/GroupHandler.cpp

@@ -534,8 +534,10 @@ void WorldSession::HandleGroupChangeSubGroupOpcode(WorldPacket & recv_data)
     std::string name;
     uint8 groupNr;
     recv_data >> name;
-
     recv_data >> groupNr;
+    
+    if (groupNr >= MAX_RAID_SUBGROUPS)
+        return;
 
     /** error handling **/
     uint64 senderGuid = GetPlayer()->GetGUID();
@@ -546,16 +548,18 @@ void WorldSession::HandleGroupChangeSubGroupOpcode(WorldPacket & recv_data)
         return;
     /********************/
 
-    Player *movedPlayer=objmgr.GetPlayer(name.c_str());
-    if (!movedPlayer)
-        return;
+    Player *movedPlayer = objmgr.GetPlayer(name.c_str());
+    if (movedPlayer)
+    {   
+        //Do not allow leader to change group of player in combat
+        if (movedPlayer->isInCombat())
+            return;
 
-    //Do not allow leader to change group of player in combat
-    if (movedPlayer->isInCombat())
-        return;
-
-    // everything's fine, do it
-    group->ChangeMembersGroup(movedPlayer, groupNr);
+        // everything's fine, do it
+        group->ChangeMembersGroup(movedPlayer, groupNr);
+    }
+    else
+        group->ChangeMembersGroup(objmgr.GetPlayerGUIDByName(name.c_str()), groupNr);
 }
 
 void WorldSession::HandleGroupAssistantLeaderOpcode(WorldPacket & recv_data)