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[truetype] Avoid reexecution of `fpgm' and `prep' in case of error. 

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=981

* include/freetype/fterrdef.h (FT_Err_DEF_In_Glyf_Bytecode): New
error code.

* src/truetype/ttinterp.c (Ins_FDEF, Ins_IDEF): Prohibit execution
of these two opcodes in `glyf' bytecode.
(TT_RunIns): Don't enforce reexecution of `fpgm' and `prep' bytecode
in case of error since function tables can no longer be modified
(due to the changes in `Ins_FDEF' and `Ins_IDEF').  This change can
enormously speed up handling of broken fonts.
This commit is contained in:
Werner Lemberg 2017-04-03 11:37:33 +02:00
parent e7b013044e
commit 093c182058
3 changed files with 35 additions and 10 deletions
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18
ChangeLog
View File

@ -1,3 +1,21 @@
2017-04-03 Werner Lemberg <wl@gnu.org>
[truetype] Avoid reexecution of `fpgm' and `prep' in case of error.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=981
* include/freetype/fterrdef.h (FT_Err_DEF_In_Glyf_Bytecode): New
error code.
* src/truetype/ttinterp.c (Ins_FDEF, Ins_IDEF): Prohibit execution
of these two opcodes in `glyf' bytecode.
(TT_RunIns): Don't enforce reexecution of `fpgm' and `prep' bytecode
in case of error since function tables can no longer be modified
(due to the changes in `Ins_FDEF' and `Ins_IDEF'). This change can
enormously speed up handling of broken fonts.
2017-04-02 Alexei Podtelezhnikov <apodtele@gmail.com>
[autofit] Disable metrics adjustment for `FT_LOAD_TARGET_LCD'.

2
include/freetype/fterrdef.h
View File

@ -231,6 +231,8 @@
"invalid PostScript (post) table format" )
FT_ERRORDEF_( Invalid_Post_Table, 0x9B,
"invalid PostScript (post) table" )
FT_ERRORDEF_( DEF_In_Glyf_Bytecode, 0x9C,
"found FDEF or IDEF opcode in glyf bytecode" )
/* CFF, CID, and Type 1 errors */

25
src/truetype/ttinterp.c
View File

@ -3564,6 +3564,13 @@
#endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */
/* FDEF is only allowed in `prep' or `fpgm' */
if ( exc->curRange == tt_coderange_glyph )
{
exc->error = FT_THROW( DEF_In_Glyf_Bytecode );
return;
}
/* some font programs are broken enough to redefine functions! */
/* We will then parse the current table. */
@ -3990,6 +3997,13 @@
TT_DefRecord* limit;
/* we enable IDEF only in `prep' or `fpgm' */
if ( exc->curRange == tt_coderange_glyph )
{
exc->error = FT_THROW( DEF_In_Glyf_Bytecode );
return;
}
/* First of all, look for the same function in our table */
def = exc->IDefs;
@ -8408,17 +8422,8 @@
exc->error = FT_THROW( Code_Overflow );
LErrorLabel_:
/* If any errors have occurred, function tables may be broken. */
/* Force a re-execution of `prep' and `fpgm' tables if no */
/* bytecode debugger is run. */
if ( exc->error &&
!exc->instruction_trap &&
exc->curRange == tt_coderange_glyph )
{
if ( exc->error && !exc->instruction_trap )
FT_TRACE1(( " The interpreter returned error 0x%x\n", exc->error ));
exc->size->bytecode_ready = -1;
exc->size->cvt_ready = -1;
}
return exc->error;
}