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[base] Fix invalid mac font recursion.

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Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=304

* src/base/ftobjs.c (FT_Open_Face): Code moved to...
(ft_open_face_internal): ... this function.
Add a parameter to control whether we try special Mac font handling
in case of failure.
(FT_Open_Face, FT_New_Face, FT_New_Memory_Face,
open_face_from_buffer): Use `ft_open_face_internal'.
This commit is contained in:
Werner Lemberg 2016-12-18 21:01:03 +01:00
parent ca3d401993
commit 5743df7718
2 changed files with 63 additions and 19 deletions
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15
ChangeLog
View File

@ -1,3 +1,18 @@
2016-12-18 Werner Lemberg <wl@gnu.org>
[base] Fix invalid mac font recursion.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=304
* src/base/ftobjs.c (FT_Open_Face): Code moved to...
(ft_open_face_internal): ... this function.
Add a parameter to control whether we try special Mac font handling
in case of failure.
(FT_Open_Face, FT_New_Face, FT_New_Memory_Face,
open_face_from_buffer): Use `ft_open_face_internal'.
2016-12-18 Werner Lemberg <wl@gnu.org>
* src/cff/cffobjs.c (cff_face_init): Make named instances work.

67
src/base/ftobjs.c
View File

@ -79,6 +79,15 @@
#define GRID_FIT_METRICS
/* forward declaration */
static FT_Error
ft_open_face_internal( FT_Library library,
const FT_Open_Args* args,
FT_Long face_index,
FT_Face *aface,
FT_Bool test_mac_fonts );
FT_BASE_DEF( FT_Pointer )
ft_service_list_lookup( FT_ServiceDesc service_descriptors,
const char* service_id )
@ -1240,7 +1249,7 @@
args.pathname = (char*)pathname;
args.stream = NULL;
return FT_Open_Face( library, &args, face_index, aface );
return ft_open_face_internal( library, &args, face_index, aface, 1 );
}
#endif
@ -1267,7 +1276,7 @@
args.memory_size = file_size;
args.stream = NULL;
return FT_Open_Face( library, &args, face_index, aface );
return ft_open_face_internal( library, &args, face_index, aface, 1 );
}
@ -1302,7 +1311,7 @@
/* Finalizer for a memory stream; gets called by FT_Done_Face(). */
/* It frees the memory it uses. */
/* From ftmac.c. */
/* From `ftmac.c'. */
static void
memory_stream_close( FT_Stream stream )
{
@ -1318,7 +1327,7 @@
/* Create a new memory stream from a buffer and a size. */
/* From ftmac.c. */
/* From `ftmac.c'. */
static FT_Error
new_memory_stream( FT_Library library,
FT_Byte* base,
@ -1338,7 +1347,7 @@
return FT_THROW( Invalid_Argument );
*astream = NULL;
memory = library->memory;
memory = library->memory;
if ( FT_NEW( stream ) )
goto Exit;
@ -1354,7 +1363,7 @@
/* Create a new FT_Face given a buffer and a driver name. */
/* from ftmac.c */
/* From `ftmac.c'. */
FT_LOCAL_DEF( FT_Error )
open_face_from_buffer( FT_Library library,
FT_Byte* base,
@ -1380,11 +1389,11 @@
return error;
}
args.flags = FT_OPEN_STREAM;
args.flags = FT_OPEN_STREAM;
args.stream = stream;
if ( driver_name )
{
args.flags = args.flags | FT_OPEN_DRIVER;
args.flags = args.flags | FT_OPEN_DRIVER;
args.driver = FT_Get_Module( library, driver_name );
}
@ -1398,7 +1407,7 @@
face_index &= 0x7FFF0000L; /* retain GX data */
#endif
error = FT_Open_Face( library, &args, face_index, aface );
error = ft_open_face_internal( library, &args, face_index, aface, 0 );
if ( !error )
(*aface)->face_flags &= ~FT_FACE_FLAG_EXTERNAL_STREAM;
@ -2111,6 +2120,17 @@
const FT_Open_Args* args,
FT_Long face_index,
FT_Face *aface )
{
return ft_open_face_internal( library, args, face_index, aface, 1 );
}
static FT_Error
ft_open_face_internal( FT_Library library,
const FT_Open_Args* args,
FT_Long face_index,
FT_Face *aface,
FT_Bool test_mac_fonts )
{
FT_Error error;
FT_Driver driver = NULL;
@ -2122,6 +2142,10 @@
FT_Module* cur;
FT_Module* limit;
#ifndef FT_CONFIG_OPTION_MAC_FONTS
FT_UNUSED( test_mac_fonts );
#endif
#ifdef FT_DEBUG_LEVEL_TRACE
FT_TRACE3(( "FT_Open_Face: " ));
@ -2212,7 +2236,8 @@
goto Success;
#ifdef FT_CONFIG_OPTION_MAC_FONTS
if ( ft_strcmp( cur[0]->clazz->module_name, "truetype" ) == 0 &&
if ( test_mac_fonts &&
ft_strcmp( cur[0]->clazz->module_name, "truetype" ) == 0 &&
FT_ERR_EQ( error, Table_Missing ) )
{
/* TrueType but essential tables are missing */
@ -2249,16 +2274,20 @@
goto Fail2;
#if !defined( FT_MACINTOSH ) && defined( FT_CONFIG_OPTION_MAC_FONTS )
error = load_mac_face( library, stream, face_index, aface, args );
if ( !error )
if ( test_mac_fonts )
{
/* We don't want to go to Success here. We've already done that. */
/* On the other hand, if we succeeded we still need to close this */
/* stream (we opened a different stream which extracted the */
/* interesting information out of this stream here. That stream */
/* will still be open and the face will point to it). */
FT_Stream_Free( stream, external_stream );
return error;
error = load_mac_face( library, stream, face_index, aface, args );
if ( !error )
{
/* We don't want to go to Success here. We've already done */
/* that. On the other hand, if we succeeded we still need to */
/* close this stream (we opened a different stream which */
/* extracted the interesting information out of this stream */
/* here. That stream will still be open and the face will */
/* point to it). */
FT_Stream_Free( stream, external_stream );
return error;
}
}
if ( FT_ERR_NEQ( error, Unknown_File_Format ) )