From e7599050dc7055bc013b4114401e62670bf86828 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Thu, 23 Jul 2020 07:06:35 +0900
Subject: Fix a bug with `ht_index` called with `size==0`; fix #5046

It happens when a hash made empty calls `rehash`.
---
 src/hash.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/hash.c b/src/hash.c
index 79b61d8b2..9a690bf1a 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -174,6 +174,11 @@ ht_index(mrb_state *mrb, htable *t)
   segment *seg;
   size_t i;
 
+  if (size == 0) {
+    t->index = NULL;
+    mrb_free(mrb, index);
+    return;
+  }
   /* allocate index table */
   if (index && index->size >= UPPER_BOUND(index->capa)) {
     size = index->capa+1;
@@ -194,7 +199,7 @@ ht_index(mrb_state *mrb, htable *t)
     index->table[i] = NULL;
   }
 
-  /* rebuld index */
+  /* rebuild index */
   mask = HT_MASK(index);
   seg = t->rootseg;
   while (seg) {
-- 
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