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[gpos] Limit recursion depth in propagate_attachment_offsets() 

Fixes https://github.com/harfbuzz/harfbuzz/issues/2927
This commit is contained in:
Behdad Esfahbod 2022-06-25 19:53:11 -06:00
parent 449bdeed5f
commit d15260ca95
1 changed files with 6 additions and 2 deletions
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8
src/hb-ot-layout-gpos-table.hh
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@ -3022,7 +3022,8 @@ static void
propagate_attachment_offsets (hb_glyph_position_t *pos,
unsigned int len,
unsigned int i,
hb_direction_t direction)
hb_direction_t direction,
unsigned nesting_level = HB_MAX_NESTING_LEVEL)
{
/* Adjusts offsets of attached glyphs (both cursive and mark) to accumulate
* offset of glyph they are attached to. */
@ -3037,7 +3038,10 @@ propagate_attachment_offsets (hb_glyph_position_t *pos,
if (unlikely (j >= len))
return;
propagate_attachment_offsets (pos, len, j, direction);
if (unlikely (!nesting_level))
return;
propagate_attachment_offsets (pos, len, j, direction, nesting_level - 1);
assert (!!(type & ATTACH_TYPE_MARK) ^ !!(type & ATTACH_TYPE_CURSIVE));