From c204c6b71bad7db3b95484f519f89da26ce7bc02 Mon Sep 17 00:00:00 2001
From: shyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 22 Aug 2007 01:32:19 +0000
Subject: 	* bignum.c (rb_big_pow): refine overflow check. 
 [ruby-dev:31242]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@13186 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 bignum.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'bignum.c')

diff --git a/bignum.c b/bignum.c
index 3517db25d7..f56c7d210b 100644
--- a/bignum.c
+++ b/bignum.c
@@ -1646,8 +1646,10 @@ rb_big_pow(x, y)
 	yy = FIX2LONG(y);
 	if (yy > 0) {
 	    VALUE z = x;
+	    const long BIGLEN_LIMIT = 1024*1024 / SIZEOF_BDIGITS;
 
-	    if (RBIGNUM(x)->len * SIZEOF_BDIGITS * yy > 1024*1024) {
+	    if ((RBIGNUM(x)->len > BIGLEN_LIMIT) ||
+		(RBIGNUM(x)->len > BIGLEN_LIMIT / yy)) {
 		rb_warn("in a**b, b may be too big");
 		d = (double)yy;
 		break;
-- 
cgit v1.2.3