From a639a39883f95365e8f336cd4770c06f3d9aa87a Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Wed, 13 Jan 2021 09:17:20 +0900
Subject: Rational denominator should not be zero.

---
 mrbgems/mruby-rational/src/rational.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mrbgems/mruby-rational/src/rational.c b/mrbgems/mruby-rational/src/rational.c
index 5e25bfb99..c63769a31 100644
--- a/mrbgems/mruby-rational/src/rational.c
+++ b/mrbgems/mruby-rational/src/rational.c
@@ -135,6 +135,9 @@ rational_new_i(mrb_state *mrb, mrb_int n, mrb_int d)
 {
   mrb_int a;
 
+  if (d == 0) {
+    mrb_raise(mrb, E_ZERODIV_ERROR, "divided by 0 in rational");
+  }
   a = i_gcd(n, d);
   if ((n == MRB_INT_MIN || d == MRB_INT_MIN) && a == -1) {
     mrb_raise(mrb, E_RANGE_ERROR, "integer overflow in rational");
-- 
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