shithub: freetype+ttf2subf

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ref: afb4ca0151959a8bedfb39a9a9140504168be7ea
parent: 2b672e7210a6e989aca4787fb81f4b2542bad9c1
author: Ben Wagner <[email protected]>
date: Thu Jan 6 07:54:15 EST 2022

[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

--- a/src/truetype/ttgxvar.c

+++ b/src/truetype/ttgxvar.c

@@ -3476,6 +3476,7 @@

       }

       else

       {

+        localpoints = NULL;

         points      = sharedpoints;

         point_count = spoint_count;

       }