From d7ca01a73ad5287f9d063bbdf5b35f472affda9d Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 30 Aug 2012 07:17:56 +0000
Subject: bigdecimal.c: check underflow

* ext/bigdecimal/bigdecimal.c (BigDecimal_to_f): check underflow since
  strtod() sets errno to ERANGE at underflow too.  [ruby-core:47342]
  [Bug #6944]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36854 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ext/bigdecimal/bigdecimal.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'ext')

diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index 866ce345fc..e8ba40a531 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -696,8 +696,10 @@ BigDecimal_to_f(VALUE self)
     VpToString(p, buf, 0, 0);
     errno = 0;
     d = strtod(buf, 0);
-    if (errno == ERANGE)
-	goto overflow;
+    if (errno == ERANGE) {
+	if (d == 0.0) goto underflow;
+	if (fabs(d) >= HUGE_VAL) goto overflow;
+    }
     return rb_float_new(d);
 
 overflow:
-- 
cgit v1.2.3