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» SmaugMuds.org » Bugfix Lists » SmaugFUSS Bugfix List » [Bug] Clan and council saving...
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[Bug] Clan and council saving could attempt to close NULL files
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Post is unread #1 Sep 12, 2005, 5:49 pm
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Samson
Black Hand
GroupAdministrators
Posts3,643
JoinedJan 1, 2002

Bug: Clan and council saving could attempt to close NULL files.
Danger: High - Undefined behaviour when closing NULL files.
Found by: Remcon
Fixed by: Remcon

---

clans.c, save_clan

Locate:
      fprintf( fp, "GuardOne     %d\n", clan->guard1 );
      fprintf( fp, "GuardTwo     %d\n", clan->guard2 );
      fprintf( fp, "End\n\n" );
      fprintf( fp, "#END\n" );
   }
   fclose( fp );
   return;


Change to:
      fprintf( fp, "GuardOne     %d\n", clan->guard1 );
      fprintf( fp, "GuardTwo     %d\n", clan->guard2 );
      fprintf( fp, "End\n\n" );
      fprintf( fp, "#END\n" );
      fclose( fp );
      fp = NULL;
   }


save_council

Locate:
      if( council->powers )
         fprintf( fp, "Powers       %s~\n", council->powers );
      fprintf( fp, "End\n\n" );
      fprintf( fp, "#END\n" );
   }
   fclose( fp );
   return;


Change to:
      if( council->powers )
         fprintf( fp, "Powers       %s~\n", council->powers );
      fprintf( fp, "End\n\n" );
      fprintf( fp, "#END\n" );
      fclose( fp );
      fp = NULL;
   }
   return;


The position of the two fclose calls was wrong. Had either of these functions been unable to open the files they worked on, the code would have attempted to close a NULL file. Doing this is considered undefined behaviour, and on some systems this will crash.
       
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