From bef5a1c8dc5fd2930e2fd395ad6c1ec4a6a0c2c3 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Fri, 18 Nov 2022 17:22:17 -0700
Subject: [PATCH] [vector] Comment

---
 src/hb-vector.hh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/hb-vector.hh b/src/hb-vector.hh
index fb6362ab3..58286892b 100644
--- a/src/hb-vector.hh
+++ b/src/hb-vector.hh
@@ -95,7 +95,11 @@ struct hb_vector_t
   void reset ()
   {
     if (unlikely (in_error ()))
-      allocated = length; // Big hack!
+      /* Big Hack! We don't know the true allocated size before
+       * an allocation failure happened. But we know it was at
+       * least as big as length. Restore it to that and continue
+       * as if error did not happen. */
+      allocated = length;
     resize (0);
   }