file.c: fix memory leak

* win32/file.c (rb_file_expand_path_internal): fix memory leaks at
  a non-absolute home exception.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43328 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Oct 17 14:21:34 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* win32/file.c (rb_file_expand_path_internal): fix memory leaks at
+	  a non-absolute home exception.
+
 Thu Oct 17 14:06:39 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* ext/objspace/object_tracing.c (newobj_i): fix memory leak.

test/ruby/test_file_exhaustive.rb

@@ -519,6 +519,33 @@ class TestFileExhaustive < Test::Unit::TestCase
     ENV["HOME"] = home
   end
 
+  if /mswin|mingw/ =~ RUBY_PLATFORM
+    def test_expand_path_home_memory_leak_in_path
+      assert_no_memory_leak_at_expand_path_home('', 'in path')
+    end
+
+    def test_expand_path_home_memory_leak_in_base
+      assert_no_memory_leak_at_expand_path_home('".",', 'in base')
+    end
+
+    def assert_no_memory_leak_at_expand_path_home(arg, message)
+      prep = 'ENV["HOME"] = "foo"*100'
+      assert_no_memory_leak([], prep, <<-TRY, "memory leaked at non-absolute home #{message}")
+      10000.times do
+        begin
+          File.expand_path(#{arg}"~/a")
+        rescue ArgumentError => e
+          next
+        ensure
+          abort("ArgumentError (non-absolute home) expected") unless e
+        end
+      end
+      GC.start
+      TRY
+    end
+  end
+
+
   def test_expand_path_remove_trailing_alternative_data
     assert_equal File.join(@rootdir, "aaa"), File.expand_path("#{@rootdir}/aaa::$DATA")
     assert_equal File.join(@rootdir, "aa:a"), File.expand_path("#{@rootdir}/aa:a:$DATA")

win32/file.c

@@ -373,6 +373,7 @@ rb_file_expand_path_internal(VALUE fname, VALUE dname, int abs_mode, int long_na
 
 	if (PathIsRelativeW(whome) && !(whome_len >= 2 && IS_DIR_UNC_P(whome))) {
 	    xfree(wpath);
+	    xfree(whome);
 	    rb_raise(rb_eArgError, "non-absolute home");
 	}
 
@@ -441,6 +442,7 @@ rb_file_expand_path_internal(VALUE fname, VALUE dname, int abs_mode, int long_na
 	    if (PathIsRelativeW(whome) && !(whome_len >= 2 && IS_DIR_UNC_P(whome))) {
 		xfree(wpath);
 		xfree(wdir);
+		xfree(whome);
 		rb_raise(rb_eArgError, "non-absolute home");
 	    }