From a197581765fa78c848f3d49233f47ec2e8fc90c0 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 22 Apr 2014 14:14:30 +0000
Subject: stringio.c: use rb_str_append

* ext/stringio/stringio.c (strio_write): use rb_str_append to
  reuse coderange bits and keep taintedness.
  [ruby-dev:48118] [Bug #9769]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45670 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/stringio/test_stringio.rb | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'test/stringio')

diff --git a/test/stringio/test_stringio.rb b/test/stringio/test_stringio.rb
index c7db91aae1..f4883455f6 100644
--- a/test/stringio/test_stringio.rb
+++ b/test/stringio/test_stringio.rb
@@ -119,6 +119,17 @@ class TestStringIO < Test::Unit::TestCase
     f.close unless f.closed?
   end
 
+  def test_write_infection
+    bug9769 = '[ruby-dev:48118] [Bug #9769]'
+    s = "".untaint
+    f = StringIO.new(s, "w")
+    f.print("bar".taint)
+    f.close
+    assert_predicate(s, :tainted?, bug9769)
+  ensure
+    f.close unless f.closed?
+  end
+
   def test_mode_error
     f = StringIO.new("", "r")
     assert_raise(IOError) { f.write("foo") }
-- 
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