Commit 22a0cccb4d9d002f33c1ba7a4b36812c7d4f46b5
2022-03-19T06:40:17
* src/base/ftobjs.c (ft_open_face_internal): Properly guard `face_index`. We must ensure that the cast to `FT_Int` doesn't change the sign. Fixes #1139.
diff --git a/src/base/ftobjs.c b/src/base/ftobjs.c
index 2c0f0e6..10952a6 100644
--- a/src/base/ftobjs.c
+++ b/src/base/ftobjs.c
@@ -2527,6 +2527,15 @@
#endif
+ /* only use lower 31 bits together with sign bit */
+ if ( face_index > 0 )
+ face_index &= 0x7FFFFFFFL;
+ else
+ {
+ face_index &= 0x7FFFFFFFL;
+ face_index = -face_index;
+ }
+
#ifdef FT_DEBUG_LEVEL_TRACE
FT_TRACE3(( "FT_Open_Face: " ));
if ( face_index < 0 )