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» SmaugMuds » Bugfix Lists » SmaugFUSS Bugfix List » [Bug] Loading color values ca...
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[Bug] Loading color values can overflow the allowed maximums
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Post is unread #1 Jan 13, 2007 11:25 pm   Last edited Jan 13, 2007 11:35 pm by Samson
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Samson
Black Hand
GroupAdministrators
Posts3,647
JoinedJan 1, 2002

Bug: Loading color values can overflow the allowed maximums
Danger: Medium - If MAX_COLORS is lower than the stored value on a pfile, the array will overflow and crash.
Found by: Remcon
Fixed by: Samson

---

save.c, fread_char

Locate:
            if( !str_cmp( word, "Colors" ) )
            {
               int x;

               for( x = 0; x < max_colors; x++ )
                  ch->colors[x] = fread_number( fp );
               fMatch = TRUE;
               break;
            }


Change to:
            if( !str_cmp( word, "Colors" ) )
            {
               int x;

               for( x = 0; x < max_colors; x++ )
                  ch->colors[x] = fread_number( fp );
               fread_to_eol( fp );
               fMatch = TRUE;
               break;
            }


Locate:
            KEY( "MaxColors", max_colors, fread_number( fp ) );


Change to:
            if( !str_cmp( word, "MaxColors" ) )
            {
               int temp = fread_number( fp );

               max_colors = UMIN( temp, MAX_COLORS );

               fMatch = TRUE;
               break;
            }


color.c, reset_colors

Locate:
         if( !str_cmp( word, "MaxColors" ) )
         {
            max_colors = fread_number( fp );
            continue;
         }
         if( !str_cmp( word, "Colors" ) )
         {
            for( x = 0; x < max_colors; ++x )
               ch->colors[x] = fread_number( fp );
            continue;
         }


Change to:
         if( !str_cmp( word, "MaxColors" ) )
         {
            int temp = fread_number( fp );
            max_colors = UMIN( temp, MAX_COLORS );
            continue;
         }
         if( !str_cmp( word, "Colors" ) )
         {
            for( x = 0; x < max_colors; ++x )
               ch->colors[x] = fread_number( fp );
            fread_to_eol( fp );
            continue;
         }


color.c, do_color

Locate:
         if( !str_cmp( word, "MaxColors" ) )
         {
            max_colors = fread_number( fp );
            continue;
         }
         if( !str_cmp( word, "Colors" ) )
         {
            for( x = 0; x < max_colors; ++x )
               ch->colors[x] = fread_number( fp );
            continue;
         }


Change to:
         if( !str_cmp( word, "MaxColors" ) )
         {
            int temp = fread_number( fp );
            max_colors = UMIN( temp, MAX_COLORS );
            continue;
         }
         if( !str_cmp( word, "Colors" ) )
         {
            for( x = 0; x < max_colors; ++x )
               ch->colors[x] = fread_number( fp );
            fread_to_eol( fp );
            continue;
         }


This is one of those quiet disasters waiting to happen. If you for some reason remove some custom color settings from the game after it has been running for awhile, people will have saved pfiles with the old information. This information includes a value setting for what MAX_COLORS was at the time the person saved. This is a Bad Thing™ if this value goes above the new MAX_COLORS setting because it will cause the array to overflow. The likely result of this is a crash.
       
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