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[cff] Fix Savannah bug #43661. 

* src/cff/cf2intrp.c (cf2_interpT2CharString) <cf2_cmdHSTEM,
cf2_cmdVSTEM, cf2_cmdHINTMASK>: Don't append to stem arrays after
hintmask is constructed.

* src/cff/cf2hints.c (cf2_hintmap_build): Add defensive code to
avoid reading past end of hintmask.
This commit is contained in:
Dave Arnold 2014-12-04 06:10:16 +01:00 committed by Werner Lemberg
parent 8fa69a88d7
commit 2cdc4562f8
3 changed files with 29 additions and 8 deletions
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11
ChangeLog
View File

@ -1,3 +1,14 @@
2014-12-04 Dave Arnold <darnold@adobe.com>
[cff] Fix Savannah bug #43661.
* src/cff/cf2intrp.c (cf2_interpT2CharString) <cf2_cmdHSTEM,
cf2_cmdVSTEM, cf2_cmdHINTMASK>: Don't append to stem arrays after
hintmask is constructed.
* src/cff/cf2hints.c (cf2_hintmap_build): Add defensive code to
avoid reading past end of hintmask.
2014-12-03 Werner Lemberg <wl@gnu.org>
docs/CHANGES: Updated.

5
src/cff/cf2hints.c
View File

@ -794,9 +794,12 @@
maskPtr = cf2_hintmask_getMaskPtr( &tempHintMask );
/* use the hStem hints only, which are first in the mask */
/* TODO: compare this to cffhintmaskGetBitCount */
bitCount = cf2_arrstack_size( hStemHintArray );
/* Defense-in-depth. Should never return here. */
if ( bitCount > hintMask->bitCount )
return;
/* synthetic embox hints get highest priority */
if ( font->blues.doEmBoxHints )
{

21
src/cff/cf2intrp.c
View File

@ -4,7 +4,7 @@
/* */
/* Adobe's CFF Interpreter (body). */
/* */
/* Copyright 2007-2013 Adobe Systems Incorporated. */
/* Copyright 2007-2014 Adobe Systems Incorporated. */
/* */
/* This software, and all works of authorship, whether in source or */
/* object code form as indicated by the copyright notice(s) included */
@ -593,8 +593,11 @@
/* never add hints after the mask is computed */
if ( cf2_hintmask_isValid( &hintMask ) )
{
FT_TRACE4(( "cf2_interpT2CharString:"
" invalid horizontal hint mask\n" ));
break;
}
cf2_doStems( font,
opStack,
@ -614,8 +617,11 @@
/* never add hints after the mask is computed */
if ( cf2_hintmask_isValid( &hintMask ) )
{
FT_TRACE4(( "cf2_interpT2CharString:"
" invalid vertical hint mask\n" ));
break;
}
cf2_doStems( font,
opStack,
@ -1141,15 +1147,16 @@
/* `cf2_hintmask_read' (which also traces the mask bytes) */
FT_TRACE4(( op1 == cf2_cmdCNTRMASK ? " cntrmask" : " hintmask" ));
/* if there are arguments on the stack, there this is an */
/* implied cf2_cmdVSTEMHM */
if ( cf2_stack_count( opStack ) != 0 )
/* never add hints after the mask is computed */
if ( cf2_stack_count( opStack ) > 1 &&
cf2_hintmask_isValid( &hintMask ) )
{
/* never add hints after the mask is computed */
if ( cf2_hintmask_isValid( &hintMask ) )
FT_TRACE4(( "cf2_interpT2CharString: invalid hint mask\n" ));
FT_TRACE4(( "cf2_interpT2CharString: invalid hint mask\n" ));
break;
}
/* if there are arguments on the stack, there this is an */
/* implied cf2_cmdVSTEMHM */
cf2_doStems( font,
opStack,
&vStemHintArray,