From 5abb283dd7323e63b12ea14cc98b35f77ba771e7 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Tue, 17 Nov 2020 22:40:02 +0900
Subject: Check division overflow (`MRB_INT_MIN` and `-1`).

---
 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 a35f2f023..85b1dff07 100644
--- a/mrbgems/mruby-rational/src/rational.c
+++ b/mrbgems/mruby-rational/src/rational.c
@@ -236,6 +236,9 @@ rational_m_int(mrb_state *mrb, mrb_int n, mrb_int d)
     b = a % b;
     a = tmp;
   }
+  if ((n == MRB_INT_MIN || d == MRB_INT_MIN) && a == -1) {
+    mrb_raise(mrb, E_RANGE_ERROR, "integer overflow in rational");
+  }
   return rational_new(mrb, n/a, d/a);
 }
 
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