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» SmaugMuds.org » Bugfix Lists » AFKMud Bugfix List » AFKMud Bug Archive » [Bug] do_mpforce performs uns...
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[Bug] do_mpforce performs unsafe removals from rooms
< Newer Topic :: Older Topic > AFKMud 1.64

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Post is unread #1 Jan 9, 2005, 11:45 am   Last edited Nov 13, 2005, 12:01 pm by Samson
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Samson
Black Hand
GroupAdministrators
Posts3,639
JoinedJan 1, 2002

Bug: do_mpforce performs actions which may remove mobs/players from the room and fails to safeguard against this.
Discovered in: AFKMud 1.64
Danger: High - Potential crash bug + pointer corruption
Found by: Samson
Fixed by: Samson

---

mud_comm.c, do_mpforce:

Locate:

   if( !str_cmp( arg, "all" ) )
   {
      CHAR_DATA *vch;

      for( vch = ch->in_room->first_person; vch; vch = vch->next_in_room )
         if( get_trust( vch ) in_room->first_person; vch; vch = vch_next )
      {
         vch_next = vch->next_in_room;

         if( get_trust( vch ) < get_trust( ch ) && can_see( ch, vch, FALSE ) )
         {
            if( cmd && IS_CMD_FLAG( cmd, CMD_NOFORCE ) )
            {
               progbugf( ch, "Mpforce: Attempted to force all to %s - command is flagged noforce", arg2 );
               return;
            }
            interpret( vch, argument );
         }
      }
   }


Replace with:
   if( !str_cmp( arg, "all" ) )
   {
      CHAR_DATA *vch, *vch_next;

      for( vch = ch->in_room->first_person; vch; vch = vch_next )
      {
         vch_next = vch->next_in_room;

         if( get_trust( vch ) < get_trust( ch ) && can_see( ch, vch, FALSE ) )
         {
            if( cmd && IS_CMD_FLAG( cmd, CMD_NOFORCE ) )
            {
               progbugf( ch, "Mpforce: Attempted to force all to %s - command is flagged noforce", arg2 );
               return;
            }
            interpret( vch, argument );
         }
      }
   }


Because the do_mpforce command calls interpret() to peform forced actions on the victims, it is possible that the victim may die, be transferred to another location, or be otherwise removed from the room list the force command is being used in. This can lead to some serious corruption of pointer lists, and even game crashes.

This bug also affects other Smaug codebases in a similar manner.
       
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