From 3b92b642eb3f7e3ed1b68bda86d073d310c5d131 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Thu, 28 Mar 2019 14:02:30 +0900
Subject: Break loop whem `sum==0` to avoid zero division; ref #4345

---
 mrbgems/mruby-math/src/math.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'mrbgems/mruby-math/src/math.c')

diff --git a/mrbgems/mruby-math/src/math.c b/mrbgems/mruby-math/src/math.c
index 39fed6cd3..ef0dc1857 100644
--- a/mrbgems/mruby-math/src/math.c
+++ b/mrbgems/mruby-math/src/math.c
@@ -120,6 +120,7 @@ erf(double x)
     term *= xsqr/j;
     sum  += term/(2*j+1);
     ++j;
+    if (sum == 0) break;
   } while (fabs(term/sum) > DBL_EPSILON);
   return two_sqrtpi*sum;
 }
-- 
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