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[sfnt] Avoid invalid face index. 

Fixes #1138.

* src/sfnt/sfobjs.c (sfnt_init_face), src/sfnt/sfwoff2.c (woff2_open_font):
Check `face_index` before decrementing.
This commit is contained in:
Werner Lemberg 2022-03-17 19:24:16 +01:00
parent 1e2eb65048
commit 53dfdcd819
2 changed files with 2 additions and 2 deletions
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2
src/sfnt/sfobjs.c
View File

@ -566,7 +566,7 @@
face_index = FT_ABS( face_instance_index ) & 0xFFFF;
/* value -(N+1) requests information on index N */
if ( face_instance_index < 0 )
if ( face_instance_index < 0 && face_index > 0 )
face_index--;
if ( face_index >= face->ttc_header.count )

2
src/sfnt/sfwoff2.c
View File

@ -2085,7 +2085,7 @@
/* Validate requested face index. */
*num_faces = woff2.num_fonts;
/* value -(N+1) requests information on index N */
if ( *face_instance_index < 0 )
if ( *face_instance_index < 0 && face_index > 0 )
face_index--;
if ( face_index >= woff2.num_fonts )