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[gpos] Protect mark attachment against out-of-bounds 

Not sure how can happen, but does...
This commit is contained in:
Behdad Esfahbod 2018-10-16 16:24:03 -07:00
parent 1147ce2392
commit 36f38ea703
1 changed files with 11 additions and 5 deletions
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16
src/hb-ot-layout-gpos-table.hh
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@ -1658,7 +1658,10 @@ reverse_cursive_minor_offset (hb_glyph_position_t *pos, unsigned int i, hb_direc
pos[j].attach_type() = type;
}
static void
propagate_attachment_offsets (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction)
propagate_attachment_offsets (hb_glyph_position_t *pos,
unsigned int len,
unsigned int i,
hb_direction_t direction)
{
/* Adjusts offsets of attached glyphs (both cursive and mark) to accumulate
* offset of glyph they are attached to. */
@ -1666,11 +1669,14 @@ propagate_attachment_offsets (hb_glyph_position_t *pos, unsigned int i, hb_direc
if (likely (!chain))
return;
unsigned int j = (int) i + chain;
pos[i].attach_chain() = 0;
propagate_attachment_offsets (pos, j, direction);
unsigned int j = (int) i + chain;
if (unlikely (j >= len))
return;
propagate_attachment_offsets (pos, len, j, direction);
assert (!!(type & ATTACH_TYPE_MARK) ^ !!(type & ATTACH_TYPE_CURSIVE));
@ -1726,7 +1732,7 @@ GPOS::position_finish_offsets (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer)
/* Handle attachments */
if (buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT)
for (unsigned int i = 0; i < len; i++)
propagate_attachment_offsets (pos, i, direction);
propagate_attachment_offsets (pos, len, i, direction);
}