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TrueType: Make FreeType ignore maxSizeOfInstructions in `maxp'. 

Acroread does the same.

* src/truetype/ttgload.c (TT_Process_Composite_Glyph): Call
`Update_Max' to adjust size of instructions array if necessary and
add a rough safety check.

(load_truetype_glyph): Save `loader->byte_len' before recursive
call.

* src/truetype/ttinterp.h, src/truetype/ttinterp.c (Update_Max):
Declare it as FT_LOCAL.
This commit is contained in:
Werner Lemberg 2010-05-20 15:38:00 +02:00
parent 236fc8e15a
commit 6da023d1ff
4 changed files with 53 additions and 10 deletions
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16
ChangeLog
View File

@ -1,3 +1,19 @@
2010-05-20 Werner Lemberg <wl@gnu.org>
TrueType: Make FreeType ignore maxSizeOfInstructions in `maxp'.
Acroread does the same.
* src/truetype/ttgload.c (TT_Process_Composite_Glyph): Call
`Update_Max' to adjust size of instructions array if necessary and
add a rough safety check.
(load_truetype_glyph): Save `loader->byte_len' before recursive
call.
* src/truetype/ttinterp.h, src/truetype/ttinterp.c (Update_Max):
Declare it as FT_LOCAL.
2010-05-18 Hongbo Ni <hongbo@njstar.com>
Apply patch #7196.

30
src/truetype/ttgload.c
View File

@ -1141,7 +1141,8 @@
{
FT_Stream stream = loader->stream;
FT_UShort n_ins;
FT_UShort n_ins, max_ins;
FT_ULong tmp;
/* TT_Load_Composite_Glyph only gives us the offset of instructions */
@ -1153,12 +1154,27 @@
FT_TRACE5(( " Instructions size = %d\n", n_ins ));
/* check it */
if ( n_ins > ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions )
max_ins = ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions;
if ( n_ins > max_ins )
{
FT_TRACE0(( "TT_Process_Composite_Glyph: too many instructions (%d)\n",
n_ins ));
/* acroread ignores this field, so we only do a rough safety check */
if ( (FT_Int)n_ins > loader->byte_len )
{
FT_TRACE1(( "TT_Process_Composite_Glyph: "
"too many instructions (%d) for glyph with length (%d)\n",
n_ins, loader->byte_len ));
return TT_Err_Too_Many_Hints;
}
return TT_Err_Too_Many_Hints;
tmp = loader->exec->glyphSize;
error = Update_Max( loader->exec->memory,
&tmp,
sizeof ( FT_Byte ),
(void*)&loader->exec->glyphIns,
n_ins );
loader->exec->glyphSize = (FT_UShort)tmp;
if ( error )
return error;
}
else if ( n_ins == 0 )
return TT_Err_Ok;
@ -1516,6 +1532,7 @@
FT_UInt num_base_subgs = gloader->base.num_subglyphs;
FT_Stream old_stream = loader->stream;
FT_Int old_byte_len = loader->byte_len;
FT_GlyphLoader_Add( gloader );
@ -1570,7 +1587,8 @@
num_base_points );
}
loader->stream = old_stream;
loader->stream = old_stream;
loader->byte_len = old_byte_len;
/* process the glyph */
loader->ins_pos = ins_pos;

7
src/truetype/ttinterp.c
View File

@ -4,8 +4,9 @@
/* */
/* TrueType bytecode interpreter (body). */
/* */
/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, */
/* 2010 */
/* by David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
@ -508,7 +509,7 @@
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
static FT_Error
FT_LOCAL_DEF( FT_Error )
Update_Max( FT_Memory memory,
FT_ULong* size,
FT_Long multiplier,

10
src/truetype/ttinterp.h
View File

@ -4,7 +4,7 @@
/* */
/* TrueType bytecode interpreter (specification). */
/* */
/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 by */
/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2010 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@ -239,6 +239,14 @@ FT_BEGIN_HEADER
FT_Int range );
FT_LOCAL( FT_Error )
Update_Max( FT_Memory memory,
FT_ULong* size,
FT_Long multiplier,
void* _pbuff,
FT_ULong new_max );
/*************************************************************************/
/* */
/* <Function> */