Return a dereferenced value of shared_ptr from a function

Here is a rookie question. Is the following code safe ?

boost::unordered_set<std::string> func()
{
      boost::shared_ptr<boost::unordered_set<std::string>> list = boost::make_shared<boost::unordered_set<std::string>>();

      // Code to populate the shared_ptr to unordered_set goes here and I do populate my set.

      return *list;
}

What will happen first ? Copying/NRVO/Moving or Destruction of shared_ptr there by causing memory fault? If unsafe, what are my alternatives ?