From 757902c497c01c88b4e960ca81ba491bf8728b45 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sat, 2 Jan 2021 23:36:41 +0900
Subject: Check `NaN` and `Infinity` before converting `Float` to `Rational`.

---
 mrbgems/mruby-rational/src/rational.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mrbgems/mruby-rational/src/rational.c b/mrbgems/mruby-rational/src/rational.c
index 1feb2530e..a151e0453 100644
--- a/mrbgems/mruby-rational/src/rational.c
+++ b/mrbgems/mruby-rational/src/rational.c
@@ -105,6 +105,9 @@ typedef float rat_float;
 #else
 typedef double rat_float;
 #endif
+
+void mrb_check_num_exact(mrb_state *mrb, mrb_float num);
+
 static mrb_value
 rational_new_f(mrb_state *mrb, mrb_float f0)
 {
@@ -116,6 +119,7 @@ rational_new_f(mrb_state *mrb, mrb_float f0)
   int64_t n = 1;
   int i, neg = 0;
 
+  mrb_check_num_exact(mrb, f0);
   if (f < 0) { neg = 1; f = -f; }
   while (f != floor(f)) { n <<= 1; f *= 2; }
   if (!TYPED_FIXABLE(f, rat_float)) {
-- 
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