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In OT::VarData::Serialize don't attempt to serialize an empty set of rows.

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Protects against incorrectly accessing rows[0] when rows is empty.
This commit is contained in:
Garret Rieger 2025-04-07 18:39:21 +00:00 • committed by Behdad Esfahbod
parent 6dff699f3f
commit b1a0a4c228
1 changed files with 6 additions and 1 deletions
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7
src/hb-ot-layout-common.hh
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@ -2863,8 +2863,13 @@ struct VarData
const hb_vector_t<const hb_vector_t<int>*>& rows)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (this))) return_trace (false);
unsigned row_count = rows.length;
if (!row_count) {
// Nothing to serialize, will be empty.
return false;
}
if (unlikely (!c->extend_min (this))) return_trace (false);
itemCount = row_count;
int min_threshold = has_long ? -65536 : -128;