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[cff] Avoid overflow/module arithmetic.

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This modifies the addition of subroutine number to subroutine bias
from unsigned to signed, but does not change any results.

* src/cff/cf2ft.c (cf2_initGlobalRegionBuffer,
cf2_initLocalRegionBuffer): Change variable names from (unsigned)
`idx' to (signed) `subrNum', since it is not an index until after
the bias is added.
* src/cff/cf2ft.h: Updated.

* src/cff/cf2intrp.c (cf2_interpT2CharString) <cf2_cmdCALLSUBR>:
Updated similarly.
This commit is contained in:
Werner Lemberg 2015-10-22 10:11:23 +02:00
parent 59ae73fe16
commit f1c93439b9
4 changed files with 35 additions and 12 deletions
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17
ChangeLog
View File

@ -1,3 +1,20 @@
2015-10-22 Dave Arnold <darnold@adobe.com>
Werner Lemberg <wl@gnu.org>
[cff] Avoid overflow/module arithmetic.
This modifies the addition of subroutine number to subroutine bias
from unsigned to signed, but does not change any results.
* src/cff/cf2ft.c (cf2_initGlobalRegionBuffer,
cf2_initLocalRegionBuffer): Change variable names from (unsigned)
`idx' to (signed) `subrNum', since it is not an index until after
the bias is added.
* src/cff/cf2ft.h: Updated.
* src/cff/cf2intrp.c (cf2_interpT2CharString) <cf2_cmdCALLSUBR>:
Updated similarly.
2015-10-22 Werner Lemberg <wl@gnu.org>
[cid] Better check of `SubrCount' dictionary entry (#46272).

14
src/cff/cf2ft.c
View File

@ -544,14 +544,17 @@
/* return 0 on success */
FT_LOCAL_DEF( CF2_Int )
cf2_initGlobalRegionBuffer( CFF_Decoder* decoder,
CF2_UInt idx,
CF2_Int subrNum,
CF2_Buffer buf )
{
CF2_UInt idx;
FT_ASSERT( decoder );
FT_ZERO( buf );
idx += (CF2_UInt)decoder->globals_bias;
idx = (CF2_UInt)( subrNum + decoder->globals_bias );
if ( idx >= decoder->num_globals )
return TRUE; /* error */
@ -628,14 +631,17 @@
FT_LOCAL_DEF( CF2_Int )
cf2_initLocalRegionBuffer( CFF_Decoder* decoder,
CF2_UInt idx,
CF2_Int subrNum,
CF2_Buffer buf )
{
CF2_UInt idx;
FT_ASSERT( decoder );
FT_ZERO( buf );
idx += (CF2_UInt)decoder->locals_bias;
idx = (CF2_UInt)( subrNum + decoder->locals_bias );
if ( idx >= decoder->num_locals )
return TRUE; /* error */

4
src/cff/cf2ft.h
View File

@ -99,7 +99,7 @@ FT_BEGIN_HEADER
FT_LOCAL( CF2_Int )
cf2_initGlobalRegionBuffer( CFF_Decoder* decoder,
CF2_UInt idx,
CF2_Int subrNum,
CF2_Buffer buf );
FT_LOCAL( FT_Error )
cf2_getSeacComponent( CFF_Decoder* decoder,
@ -110,7 +110,7 @@ FT_BEGIN_HEADER
CF2_Buffer buf );
FT_LOCAL( CF2_Int )
cf2_initLocalRegionBuffer( CFF_Decoder* decoder,
CF2_UInt idx,
CF2_Int subrNum,
CF2_Buffer buf );
FT_LOCAL( CF2_Fixed )

12
src/cff/cf2intrp.c
View File

@ -746,7 +746,7 @@
case cf2_cmdCALLGSUBR:
case cf2_cmdCALLSUBR:
{
CF2_UInt subrIndex;
CF2_Int subrNum;
FT_TRACE4(( op1 == cf2_cmdCALLGSUBR ? " callgsubr"
@ -766,17 +766,17 @@
(size_t)charstringIndex + 1 );
/* set up the new CFF region and pointer */
subrIndex = (CF2_UInt)cf2_stack_popInt( opStack );
subrNum = cf2_stack_popInt( opStack );
switch ( op1 )
{
case cf2_cmdCALLGSUBR:
FT_TRACE4(( " (idx %d, entering level %d)\n",
subrIndex + (CF2_UInt)decoder->globals_bias,
subrNum + decoder->globals_bias,
charstringIndex + 1 ));
if ( cf2_initGlobalRegionBuffer( decoder,
subrIndex,
subrNum,
charstring ) )
{
lastError = FT_THROW( Invalid_Glyph_Format );
@ -787,11 +787,11 @@
default:
/* cf2_cmdCALLSUBR */
FT_TRACE4(( " (idx %d, entering level %d)\n",
subrIndex + (CF2_UInt)decoder->locals_bias,
subrNum + decoder->locals_bias,
charstringIndex + 1 ));
if ( cf2_initLocalRegionBuffer( decoder,
subrIndex,
subrNum,
charstring ) )
{
lastError = FT_THROW( Invalid_Glyph_Format );