tree 32bef020212ed4be4958299dda771993cbb03b74
parent 2b672e7210a6e989aca4787fb81f4b2542bad9c1
author Ben Wagner <bungeman@chromium.org> 1641491655 -0500
committer Werner Lemberg <wl@gnu.org> 1641492780 +0100

[truetype] Reset localpoints when varying cvt.

When iterating over the cvt tuples and reading in the points it is necessary
to set all of `localpoints`, `points`, and `point_count` in all cases.  The
existing code did not reset `localpoints` to `NULL` when there were no
private point numbers.  If the previous tuple did have private point numbers
and set `localpoints` to `ALL_POINTS` this would not be cleared and the
wrong branch would be taken later, leading to possible heap buffer overflow.

* src/truetype/ttgxvar.c (tt_face_vary_cvt): Reset `localpoints` to `NULL`
when it isn't valid.

Fixes: https://crbug.com/1284742