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[sfnt] Another fix for buggy variation fonts.

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Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=759

* src/sfnt/sfobjs.c (sfnt_init_face): While setting number of
instances to zero for `CFF' fonts table, ensure that there is no
`CFF2' present also (which gets priority).
This commit is contained in:
Werner Lemberg 2017-03-08 15:09:41 +01:00
parent 7d7aae1de3
commit 7bbb91fbf4
2 changed files with 15 additions and 1 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2017-03-08 Werner Lemberg <wl@gnu.org>
[sfnt] Another fix for buggy variation fonts.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=759
* src/sfnt/sfobjs.c (sfnt_init_face): While setting number of
instances to zero for `CFF' fonts table, ensure that there is no
`CFF2' present also (which gets priority).
2017-03-07 Werner Lemberg <wl@gnu.org>
[sfnt] Improve handling for buggy variation fonts.

4
src/sfnt/sfobjs.c
View File

@ -1058,8 +1058,10 @@
FT_FREE( default_values );
FT_FREE( instance_values );
/* we don't support Multiple Master CFFs yet */
/* we don't support Multiple Master CFFs yet; */
/* note that `glyf' or `CFF2' have precedence */
if ( face->goto_table( face, TTAG_glyf, stream, 0 ) &&
face->goto_table( face, TTAG_CFF2, stream, 0 ) &&
!face->goto_table( face, TTAG_CFF, stream, 0 ) )
num_instances = 0;