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diff --git a/src/OT/Layout/GDEF/GDEF.hh b/src/OT/Layout/GDEF/GDEF.hh
--- a/src/OT/Layout/GDEF/GDEF.hh
+++ b/src/OT/Layout/GDEF/GDEF.hh
@@ -472,8 +472,10 @@ struct MarkGlyphSetsFormat1
{
for (const auto &offset : coverage)
{
+ if (unlikely (!sets.resize (sets.length + 1)))
+ return;
const auto &cov = this+offset;
- cov.collect_coverage (sets.push ());
+ cov.collect_coverage (&sets.tail ());
}
}