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[UVS] Stabilizes UVS supporting functions against non-UVS fonts. 

UVS supporting functions assume the variation handler functions
are valid.  When a font without cmap format 14 is given, these
function pointers are left as NULL, so calling these functions
causes NULL pointer dereference.

* src/base/ftobjs.c (FT_Face_GetCharVariantIndex): Check the pointer
FT_CMap_Class->char_var_index before calling it.
(FT_Face_GetCharVariantIsDefault): Check the pointer
FT_CMap_Class->char_var_default before calling it.
(FT_Face_GetVariantSelectors): Check the pointer
FT_CMap_Class->variant_list before calling it.
(FT_Face_GetVariantsOfChar): Check the pointer
FT_CMap_Class->charvariant_list before calling it.
(FT_Face_GetCharsOfVariant): Check the pointer
FT_CMap_Class->variantchar_list before calling it.
This commit is contained in:
suzuki toshiya 2010-11-04 21:53:11 +09:00
parent 6aee69096f
commit e891e4d6f1
2 changed files with 40 additions and 0 deletions
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20
ChangeLog
View File

@ -1,3 +1,23 @@
2010-11-04 suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
[UVS] Stabilizes UVS supporting functions against non-UVS fonts.
UVS supporting functions assume the variation handler functions
are valid. When fonts without cmap format 14 is given, these
function pointers are left as NULL, so calling these functions
causes NULL pointer dereference.
* src/base/ftobjs.c (FT_Face_GetCharVariantIndex): Check the pointer
FT_CMap_Class->char_var_index before calling it.
(FT_Face_GetCharVariantIsDefault): Check the pointer
FT_CMap_Class->char_var_default before calling it.
(FT_Face_GetVariantSelectors): Check the pointer
FT_CMap_Class->variant_list before calling it.
(FT_Face_GetVariantsOfChar): Check the pointer
FT_CMap_Class->charvariant_list before calling it.
(FT_Face_GetCharsOfVariant): Check the pointer
FT_CMap_Class->variantchar_list before calling it.
2010-11-01 Alexei Podtelezhnikov <apodtele@gmail.com>
[ftsmooth] Improve rendering.

20
src/base/ftobjs.c
View File

@ -3291,6 +3291,10 @@
FT_CMap vcmap = FT_CMAP( charmap );
/* font without TT cmap format 14 has no char_var_index() */
if ( !( vcmap->clazz ) || !( vcmap->clazz->char_var_index ) )
return result;
if ( charcode > 0xFFFFFFFFUL )
{
FT_TRACE1(( "FT_Get_Char_Index: too large charcode" ));
@ -3332,6 +3336,10 @@
FT_CMap vcmap = FT_CMAP( charmap );
/* font without TT cmap format 14 has no char_var_index() */
if ( !( vcmap->clazz ) || !( vcmap->clazz->char_var_default ) )
return result;
if ( charcode > 0xFFFFFFFFUL )
{
FT_TRACE1(( "FT_Get_Char_Index: too large charcode" ));
@ -3372,6 +3380,10 @@
FT_Memory memory = FT_FACE_MEMORY( face );
/* font without TT cmap format 14 has no variant_list() */
if ( !( vcmap->clazz ) || !( vcmap->clazz->variant_list ) )
return result;
result = vcmap->clazz->variant_list( vcmap, memory );
}
}
@ -3400,6 +3412,10 @@
FT_Memory memory = FT_FACE_MEMORY( face );
/* font without TT cmap format 14 has no charvariant_list() */
if ( !( vcmap->clazz ) || !( vcmap->clazz->charvariant_list ) )
return result;
if ( charcode > 0xFFFFFFFFUL )
{
FT_TRACE1(( "FT_Get_Char_Index: too large charcode" ));
@ -3434,6 +3450,10 @@
FT_Memory memory = FT_FACE_MEMORY( face );
/* font without TT cmap format 14 has no variantchar_list() */
if ( !( vcmap->clazz ) || !( vcmap->clazz->variantchar_list ) )
return result;
if ( variantSelector > 0xFFFFFFFFUL )
{
FT_TRACE1(( "FT_Get_Char_Index: too large variantSelector" ));