gnutls_session_get_data (gnutls_session_t session,
                         void *session_data, size_t * session_data_size)
{

  gnutls_datum_t psession;
  int ret;

  if (session->internals.resumable == RESUME_FALSE)
    return GNUTLS_E_INVALID_SESSION;

  psession.data = session_data;

  ret = _gnutls_session_pack (session, &psession);
  if (ret < 0)
    {
      gnutls_assert ();
      return ret;
    }
 
   if (psession.size > *session_data_size)
     {
      *session_data_size = psession.size;
       ret = GNUTLS_E_SHORT_MEMORY_BUFFER;
       goto error;
     }

  if (session_data != NULL)
    memcpy (session_data, psession.data, psession.size);

  ret = 0;

error:
  _gnutls_free_datum (&psession);
  return ret;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.