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[sfnt] Fix color glyph layer loading.

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* src/sfnt/ttcolr.c (Colr): Add `table_size' field.
(tt_face_load_colr): Set it.
(tt_face_get_colr_layer): Check pointer limit for layer entries.
This commit is contained in:
Werner Lemberg 2018-06-16 22:16:03 +02:00
parent 1079063701
commit 9960e7beab
2 changed files with 20 additions and 4 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2018-06-16 Werner Lemberg <wl@gnu.org>
[sfnt] Fix color glyph layer loading.
* src/sfnt/ttcolr.c (Colr): Add `table_size' field.
(tt_face_load_colr): Set it.
(tt_face_get_colr_layer): Check pointer limit for layer entries.
2018-06-16 Werner Lemberg <wl@gnu.org>
[sfnt] Fix color palette loading.

16
src/sfnt/ttcolr.c
View File

@ -64,7 +64,8 @@
FT_Byte* layers;
/* The memory which backs up the `COLR' table. */
void* table;
void* table;
FT_ULong table_size;
} Colr;
@ -138,6 +139,7 @@
colr->base_glyphs = (FT_Byte*)( table + base_glyph_offset );
colr->layers = (FT_Byte*)( table + layer_offset );
colr->table = table;
colr->table_size = table_size;
face->colr = colr;
@ -220,6 +222,9 @@
if ( !iterator->p )
{
FT_ULong offset;
/* first call to function */
iterator->layer = 0;
@ -229,13 +234,16 @@
&glyph_record ) )
return 0;
iterator->p = colr->layers +
LAYER_SIZE * glyph_record.first_layer_index;
if ( glyph_record.num_layers )
iterator->num_layers = glyph_record.num_layers;
else
return 0;
offset = LAYER_SIZE * glyph_record.first_layer_index;
if ( offset + LAYER_SIZE * glyph_record.num_layers > colr->table_size )
return 0;
iterator->p = colr->layers + offset;
}
if ( iterator->layer >= iterator->num_layers )