string.c: fix rb_str_init

* string.c (rb_str_init): fix segfault and memory leak, consider
  wide char encoding terminator.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53855 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 18 insertions, 0 deletions

diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index c78ecc1d6c..4df5f4f841 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -70,6 +70,24 @@ class TestString < Test::Unit::TestCase
     assert_raise(RuntimeError){ str.__send__(:initialize, 'abc', capacity: 1000, encoding: 'euc-jp') }
   end
 
+  def test_initialize_nonstring
+    assert_raise(TypeError) {
+      S(1)
+    }
+    assert_raise(TypeError) {
+      S(1, capacity: 1000)
+    }
+  end
+
+  def test_initialize_memory_leak
+    assert_no_memory_leak([], <<-PREP, <<-CODE, rss: true)
+code = proc {('x'*100000).__send__(:initialize, '')}
+1_000.times(&code)
+PREP
+100_000.times(&code)
+CODE
+  end
+
   def test_AREF # '[]'
     assert_equal("A",  S("AooBar")[0])
     assert_equal("B",  S("FooBaB")[-1])