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[psaux] Check large integers while parsing charstrings.

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* src/psaux/t1decode.c (t1_decoder_parse_charstrings): Large
integers must be followed by a `div' operator.
This commit is contained in:
Werner Lemberg 2009-06-20 09:31:19 +02:00
parent 541ab5adda
commit 41821f8a8a
2 changed files with 40 additions and 0 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2009-06-20 Werner Lemberg <wl@gnu.org>
[psaux] Check large integers while parsing charstrings.
* src/psaux/t1decode.c (t1_decoder_parse_charstrings): Large
integers must be followed by a `div' operator.
2009-06-20 Werner Lemberg <wl@gnu.org>
[cff] Revert last change.

33
src/psaux/t1decode.c
View File

@ -337,6 +337,7 @@
FT_Pos x, y, orig_x, orig_y;
FT_Int known_othersubr_result_cnt = 0;
FT_Int unknown_othersubr_result_cnt = 0;
FT_Bool large_int;
T1_Hints_Funcs hinter;
@ -387,6 +388,8 @@
if ( hinter )
hinter->open( hinter->hints );
large_int = FALSE;
/* now, execute loop */
while ( ip < limit )
{
@ -531,6 +534,25 @@
((FT_Long)ip[2] << 8 ) |
ip[3] );
ip += 4;
/* According to the specification, values > 32000 or < -32000 must */
/* be followed by a `div' operator to make the result be in the */
/* range [-32000;32000]. We expect that the second argument of */
/* `div' is not a large number. Additionally, we don't handle */
/* stuff like `<large1> <large2> <num> div <num> div' or */
/* <large1> <num> <large2> <num> div div'. This is probably not */
/* allowed anyway. */
if ( value > 32000 || value < -32000 )
{
if ( large_int )
{
FT_ERROR(( "t1_decoder_parse_charstrings:" ));
FT_ERROR(( " no `div' after large integer\n" ));
}
else
large_int = TRUE;
}
break;
default:
@ -578,6 +600,14 @@
}
}
if ( large_int && !( op == op_none || op == op_div ) )
{
FT_ERROR(( "t1_decoder_parse_charstrings:" ));
FT_ERROR(( " no `div' after large integer\n" ));
large_int = FALSE;
}
/*********************************************************************/
/* */
/* Push value on stack, or process operator */
@ -1224,6 +1254,9 @@
FT_ERROR(( "t1_decoder_parse_charstrings: division by 0\n" ));
goto Syntax_Error;
}
large_int = FALSE;
break;
case op_callsubr: