From b9eeeac5c87591ca43fdb6aaafb521a84d7d3800 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 13 Jul 2013 15:19:48 +0000
Subject: * bignum.c (big_shift): Avoid signed integer overflow.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41959 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 bignum.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'bignum.c')

diff --git a/bignum.c b/bignum.c
index a20f8369fd..fb3954624c 100644
--- a/bignum.c
+++ b/bignum.c
@@ -5283,7 +5283,7 @@ static VALUE
 big_shift(VALUE x, long n)
 {
     if (n < 0)
-	return big_lshift(x, (unsigned long)-n);
+	return big_lshift(x, 1+(unsigned long)(-(n+1)));
     else if (n > 0)
 	return big_rshift(x, (unsigned long)n);
     return x;
-- 
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