thread.c: check name argument

* thread.c (rb_thread_setname): check the argument if valid
  string.  [ruby-core:71774] [Bug #11756]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52834 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Tue Dec  1 23:14:04 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* thread.c (rb_thread_setname): check the argument if valid
+	  string.  [ruby-core:71774] [Bug #11756]
+
 Tue Dec  1 17:13:41 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* string.c (rb_string_value_cstr): should not raise on frozen

test/ruby/test_thread.rb

@@ -1057,4 +1057,22 @@ q.pop
     t.kill
     t.join
   end
+
+  def test_thread_invalid_name
+    bug11756 = '[ruby-core:71774] [Bug #11756]'
+    t = Thread.start {}
+    assert_raise(ArgumentError, bug11756) {t.name = "foo\0bar"}
+  ensure
+    t.kill
+    t.join
+  end
+
+  def test_thread_invalid_object
+    bug11756 = '[ruby-core:71774] [Bug #11756]'
+    t = Thread.start {}
+    assert_raise(TypeError, bug11756) {t.name = nil}
+  ensure
+    t.kill
+    t.join
+  end
 end

thread.c

@@ -2776,6 +2776,7 @@ rb_thread_setname(VALUE thread, VALUE name)
 {
     rb_thread_t *th;
     GetThreadPtr(thread, th);
+    StringValueCStr(name);
     th->name = rb_str_new_frozen(name);
 #if defined(HAVE_PTHREAD_SETNAME_NP)
 # if defined(__linux__)