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[truetype] Prevent bytecode reuse after the interpretation error. 

* src/truetype/ttinterp.c (free_buffer_in_size): New function to
free the buffer allocated during the interpretation of this glyph.
(TT_RunIns): Unset FT_Face->size->{cvt_ready,bytecode_ready} if
an error occurs in the bytecode interpretation.  The interpretation
of invalid bytecode may break the function definitions and referring
them in later interpretation is danger.  By unsetting these flags,
`fpgm' and `prep' tables are executed again in next interpretation.

Fix Savannah bug #30798, reported by Robert Swiecki.
This commit is contained in:
suzuki toshiya 2010-08-31 01:23:30 +09:00
parent 12cf031644
commit 29e044a4af
2 changed files with 59 additions and 0 deletions
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14
ChangeLog
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@ -1,3 +1,17 @@
2010-08-30 suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
[truetype] Prevent bytecode reuse after the interpretation error.
* src/truetype/ttinterp.c (free_buffer_in_size): New function to
free the buffer allocated during the interpretation of this glyph.
(TT_RunIns): Unset FT_Face->size->{cvt_ready,bytecode_ready} if
an error occurs in the bytecode interpretation. The interpretation
of invalid bytecode may break the function definitions and referring
them in later interpretation is danger. By unsetting these flags,
`fpgm' and `prep' tables are executed again in next interpretation.
Fix Savannah bug #30798, reported by Robert Swiecki.
2010-08-29 Werner Lemberg <wl@gnu.org>
[ftraster] Pacify compiler.

45
src/truetype/ttinterp.c
View File

@ -7362,6 +7362,41 @@
#endif /* !TT_CONFIG_OPTION_INTERPRETER_SWITCH */
static void
free_buffer_in_size( TT_ExecContext exc )
{
FT_Memory memory = exc->memory;
TT_Size size = exc->size;
TT_GlyphZoneRec twilight;
if ( !size )
return;
if ( size->function_defs )
FT_FREE( size->function_defs );
if ( size->instruction_defs )
FT_FREE( size->instruction_defs );
if ( size->cvt )
FT_FREE( size->cvt );
if ( size->storage )
FT_FREE( size->storage );
twilight = size->twilight;
if ( twilight.org )
FT_FREE( twilight.org );
if ( twilight.cur )
FT_FREE( twilight.cur );
if ( twilight.orus )
FT_FREE( twilight.orus );
if ( twilight.tags )
FT_FREE( twilight.tags );
if ( twilight.contours )
FT_FREE( twilight.contours );
}
/*************************************************************************/
/* */
/* RUN */
@ -8128,6 +8163,16 @@
*exc = cur;
#endif
/* if any errors, function tables may be broken. */
/* it should not be used for next interpretation. */
if ( CUR.error )
{
FT_TRACE7(( " The interpreter got an error = %d\n", CUR.error ));
free_buffer_in_size( exc );
exc->size->cvt_ready = FALSE;
exc->size->bytecode_ready = FALSE;
}
return CUR.error;
}