From 9ae4c2d59098ce6158385dda2539d2b36a03c090 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 27 Mar 2016 23:18:52 +0000
Subject: sprintf.c: fix buffer overflow

* sprintf.c (rb_str_format): fix buffer overflow, length must be
  greater than precision.  reported by William Bowling <will AT
  wbowling.info>.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54304 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/ruby/test_sprintf.rb | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'test')

diff --git a/test/ruby/test_sprintf.rb b/test/ruby/test_sprintf.rb
index 501930a1e5..5732cecbf9 100644
--- a/test/ruby/test_sprintf.rb
+++ b/test/ruby/test_sprintf.rb
@@ -177,6 +177,10 @@ class TestSprintf < Test::Unit::TestCase
     assert_equal("x"*10+"     1.0", sprintf("x"*10+"%8.1f", 1r), bug11766)
   end
 
+  def test_rational_precision
+    assert_match(/\A0\.\d{600}\z/, sprintf("%.600f", 600**~60))
+  end
+
   def test_hash
     options = {:capture=>/\d+/}
     assert_equal("with options {:capture=>/\\d+/}", sprintf("with options %p" % options))
-- 
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