_dbus_connect_unix_socket (const char     *path,
                           dbus_bool_t     abstract,
                           DBusError      *error)
{
  int fd;
  size_t path_len;
  struct sockaddr_un addr;

  _DBUS_ASSERT_ERROR_IS_CLEAR (error);

  _dbus_verbose ("connecting to unix socket %s abstract=%d\n",
                 path, abstract);


  if (!_dbus_open_unix_socket (&fd, error))
    {
      _DBUS_ASSERT_ERROR_IS_SET(error);
      return -1;
    }
  _DBUS_ASSERT_ERROR_IS_CLEAR(error);

  _DBUS_ZERO (addr);
  addr.sun_family = AF_UNIX;
  path_len = strlen (path);

  if (abstract)
    {
#ifdef HAVE_ABSTRACT_SOCKETS
      addr.sun_path[0] = '\0'; /* this is what says "use abstract" */
      path_len++; /* Account for the extra nul byte added to the start of sun_path */

      if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
        {
          dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
                      "Abstract socket name too long\n");
          _dbus_close (fd, NULL);
          return -1;
	}

      strncpy (&addr.sun_path[1], path, path_len);
      /* _dbus_verbose_bytes (addr.sun_path, sizeof (addr.sun_path)); */
#else /* HAVE_ABSTRACT_SOCKETS */
      dbus_set_error (error, DBUS_ERROR_NOT_SUPPORTED,
                      "Operating system does not support abstract socket namespace\n");
      _dbus_close (fd, NULL);
      return -1;
#endif /* ! HAVE_ABSTRACT_SOCKETS */
    }
  else
    {
      if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
        {
          dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
                      "Socket name too long\n");
          _dbus_close (fd, NULL);
          return -1;
	}

      strncpy (addr.sun_path, path, path_len);
    }

  if (connect (fd, (struct sockaddr*) &addr, _DBUS_STRUCT_OFFSET (struct sockaddr_un, sun_path) + path_len) < 0)
    {
      dbus_set_error (error,
                      _dbus_error_from_errno (errno),
                      "Failed to connect to socket %s: %s",
                      path, _dbus_strerror (errno));

      _dbus_close (fd, NULL);
      return -1;
    }

  if (!_dbus_set_fd_nonblocking (fd, error))
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);

      _dbus_close (fd, NULL);
      return -1;
    }

  return fd;
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.