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» SmaugMuds.org » Bugfix Lists » SWFOTE FUSS Bugfix List » [Bug] Introduction code has b...
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[Bug] Introduction code has bad name pointer handling
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Post is unread #1 Sep 30, 2006, 7:21 pm
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Samson
Black Hand
GroupAdministrators
Posts3,639
JoinedJan 1, 2002

Bug: Introduction code has bad name pointer handling
Danger: Critical - High probability of crashing with NULL pointers.
Found by: Phoenix Dracul
Fixed by: Keberus

---

act_info.c, do_introduce

Locate:
   CREATE( fellow, FELLOW_DATA, 1 );
   fellow->victim = ch->name;
   fellow->knownas = STRALLOC( argument );
   LINK( fellow, victim->first_fellow, victim->last_fellow, next, prev );


Change to:
   CREATE( fellow, FELLOW_DATA, 1 );
   fellow->victim = QUICKLINK( ch->name );
   fellow->knownas = STRALLOC( argument );
   LINK( fellow, victim->first_fellow, victim->last_fellow, next, prev );


act_info.c, do_remember

Locate:
   CREATE( nfellow, FELLOW_DATA, 1 );
   nfellow->victim = victim->name;
   nfellow->knownas = STRALLOC( argument );
   LINK( nfellow, ch->first_fellow, ch->last_fellow, next, prev );


Change to:
   CREATE( nfellow, FELLOW_DATA, 1 );
   nfellow->victim = QUICKLINK( victim->name );
   nfellow->knownas = STRALLOC( argument );
   LINK( nfellow, ch->first_fellow, ch->last_fellow, next, prev );


act_info.c, do_describe

Locate:
         CREATE( nfellow, FELLOW_DATA, 1 );
         nfellow->victim = fellow->victim;
         nfellow->knownas = fellow->knownas;
         LINK( nfellow, victim->first_fellow, victim->last_fellow, next, prev );


Change to:
         CREATE( nfellow, FELLOW_DATA, 1 );
         nfellow->victim = QUICKLINK( victim->name );
         nfellow->knownas = STRALLOC( argument );
         LINK( nfellow, ch->first_fellow, ch->last_fellow, next, prev );


With the way the nfellow->victim field was being assigned, it pointed directly to the same thing as the other player's name. when that person leaves the game the nfellow pointer now holds invalid data in it which will cause a crash the moment it's accessed.
       
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