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[psaux] Fix handling of invalid flex subrs. 

Problem reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=52

* src/psaux/t1decode.c (t1_decoder_parse_charstrings)
<op_callothersubr>: Set `flex_state' after error checking.
This commit is contained in:
Werner Lemberg 2016-10-11 08:57:55 +02:00
parent 922812281c
commit 9c54d1246a
2 changed files with 25 additions and 13 deletions
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11
ChangeLog
View File

@ -1,3 +1,14 @@
2016-10-11 Werner Lemberg <wl@gnu.org>
[psaux] Fix handling of invalid flex subrs.
Problem reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=52
* src/psaux/t1decode.c (t1_decoder_parse_charstrings)
<op_callothersubr>: Set `flex_state' after error checking.
2016-10-11 Werner Lemberg <wl@gnu.org>
* src/truetype/ttgxvar.c (tt_done_blend): Fix deallocation.

27
src/psaux/t1decode.c
View File

@ -734,7 +734,7 @@
if ( arg_cnt != 3 )
goto Unexpected_OtherSubr;
if ( decoder->flex_state == 0 ||
if ( !decoder->flex_state ||
decoder->num_flex_vectors != 7 )
{
FT_ERROR(( "t1_decoder_parse_charstrings:"
@ -752,13 +752,14 @@
if ( arg_cnt != 0 )
goto Unexpected_OtherSubr;
if ( ( error = t1_builder_start_point( builder, x, y ) )
!= FT_Err_Ok ||
( error = t1_builder_check_points( builder, 6 ) )
!= FT_Err_Ok )
goto Fail;
decoder->flex_state = 1;
decoder->num_flex_vectors = 0;
if ( ( error = t1_builder_start_point( builder, x, y ) )
!= FT_Err_Ok ||
( error = t1_builder_check_points( builder, 6 ) )
!= FT_Err_Ok )
goto Fail;
break;
case 2: /* add flex vectors */
@ -769,7 +770,7 @@
if ( arg_cnt != 0 )
goto Unexpected_OtherSubr;
if ( decoder->flex_state == 0 )
if ( !decoder->flex_state )
{
FT_ERROR(( "t1_decoder_parse_charstrings:"
" missing flex start\n" ));
@ -1222,9 +1223,9 @@
FT_TRACE4(( " hvcurveto" ));
if ( ( error = t1_builder_start_point( builder, x, y ) )
!= FT_Err_Ok ||
!= FT_Err_Ok ||
( error = t1_builder_check_points( builder, 3 ) )
!= FT_Err_Ok )
!= FT_Err_Ok )
goto Fail;
x += top[0];
@ -1269,9 +1270,9 @@
FT_TRACE4(( " rrcurveto" ));
if ( ( error = t1_builder_start_point( builder, x, y ) )
!= FT_Err_Ok ||
!= FT_Err_Ok ||
( error = t1_builder_check_points( builder, 3 ) )
!= FT_Err_Ok )
!= FT_Err_Ok )
goto Fail;
x += top[0];
@ -1291,9 +1292,9 @@
FT_TRACE4(( " vhcurveto" ));
if ( ( error = t1_builder_start_point( builder, x, y ) )
!= FT_Err_Ok ||
!= FT_Err_Ok ||
( error = t1_builder_check_points( builder, 3 ) )
!= FT_Err_Ok )
!= FT_Err_Ok )
goto Fail;
y += top[0];