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» SmaugMuds.org » Bugfix Lists » SmaugFUSS Bugfix List » [Bug] leave_prog can crash th...
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[Bug] leave_prog can crash the game by closing an exit
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Post is unread #1 Sep 7, 2006, 9:00 pm   Last edited Mar 10, 2008, 6:53 pm by Samson
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Samson
Black Hand
GroupAdministrators
Posts3,644
JoinedJan 1, 2002

Bug: leave_prog can crash the game by closing an exit
Danger: High - Groups travelling through a room with a leave_prog that closes an exit stand a good chance of causing a crash.
Found by: Valcados
Fixed by: Samson/Remcon

---

act_move.c, move_char

Locate:
         if( fch != ch  /* loop room bug fix here by Thoric */
             && fch->master == ch && fch->position == POS_STANDING )
         {
            act( AT_ACTION, "You follow $N.", fch, NULL, ch, TO_CHAR );
            move_char( fch, pexit, 0 );
         }


Change to:
         if( fch != ch  /* loop room bug fix here by Thoric */
             && fch->master == ch && fch->position == POS_STANDING )
         {
            if( !get_exit( from_room, door ) )
            {
              act( AT_ACTION, "The entrance closes behind $N, preventing you from following!", fch, NULL, ch, TO_CHAR );
              continue;
            }
            act( AT_ACTION, "You follow $N.", fch, NULL, ch, TO_CHAR );
            move_char( fch, pexit, 0 );
         }


Ordinarily not much of a problem. But if a room has a leave_prog which closes an exit that the group is trying to follow the leader through, the game will probably crash. The reason being is that the exit pointer that move_char has gets removed when the exit is extracted. So the following loop is trying to use an invalid pointer. So to prevent this and other methods of exit removal from causing a crash, the exit pointer needs to be validated for every follower in the group.

A much more involved alternative fix is also available here: http://www.smaugmuds.org/index.php?a=topic&t=2212
       
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