Fix memory leaks in Windows variant of _dbus_directory_open()

If the memory is not sufficient, the created DBusString instance must be
released. This belongs to the mentioned function and
_dbus_string_init_from_string().

Fixes #360

2 files changed, 14 insertions, 5 deletions

diff --git a/dbus/dbus-string.c b/dbus/dbus-string.c
index 4c31bdc3..529a099e 100644
--- a/dbus/dbus-string.c
+++ b/dbus/dbus-string.c
@@ -241,8 +241,10 @@ _dbus_string_init_const_len (DBusString *str,
 }
 
 /**
- * Initializes a string from another string. The
- * string must eventually be freed with _dbus_string_free().
+ * Initializes a string from another string
+ *
+ * The string must be freed with _dbus_string_free() in case of success.
+ * In case of error the string is freed by this function itself.
  *
  * @param str memory to hold the string
  * @param from instance from which the string is initialized
@@ -252,9 +254,14 @@ dbus_bool_t
 _dbus_string_init_from_string(DBusString       *str,
                               const DBusString *from)
 {
- if (!_dbus_string_init (str))
-     return FALSE;
- return _dbus_string_append (str, _dbus_string_get_const_data (from));
+  if (!_dbus_string_init (str))
+    return FALSE;
+  if (!_dbus_string_append (str, _dbus_string_get_const_data (from)))
+    {
+      _dbus_string_free (str);
+      return FALSE;
+    }
+  return TRUE;
 }
 
 /**
diff --git a/dbus/dbus-sysdeps-util-win.c b/dbus/dbus-sysdeps-util-win.c
index 4e23b494..c572fcd0 100644
--- a/dbus/dbus-sysdeps-util-win.c
+++ b/dbus/dbus-sysdeps-util-win.c
@@ -426,6 +426,7 @@ _dbus_directory_open (const DBusString *filename,
     {
       if (!_dbus_string_append (&filespec, "*"))
         {
+          _dbus_string_free (&filespec);
           dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
                           "Could not append filename wildcard");
           return NULL;
@@ -435,6 +436,7 @@ _dbus_directory_open (const DBusString *filename,
     {
       if (!_dbus_string_append (&filespec, "\\*"))
         {
+          _dbus_string_free (&filespec);
           dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
                           "Could not append filename wildcard 2");
           return NULL;