[Octave-bug-tracker] [bug #53925] segfault in debug mode when using TAB-complete from readline

[John W. Eaton]

Follow-up Comment #1, bug #53925 (project octave):

I also see this problem on stable, so if possible it should be fixed there.

It's crashing here in the condition of the while loop in this function in
help.cc:


  // Return a vector of all functions from this file,
  // for use in command line auto-completion.
  string_vector help_system::local_functions (void) const
  {
    string_vector retval;

    call_stack& cs = m_interpreter.get_call_stack ();

    octave_user_code *curr_fcn = cs.caller_user_code ();

    if (! curr_fcn)
      return retval;

    // All subfunctions are listed in the top-level function of this file.
    while (curr_fcn->is_subfunction ())
      {
        symbol_scope pscope = curr_fcn->parent_fcn_scope ();
        curr_fcn = pscope.function ();
      }

    // Get subfunctions.
    const std::list<std::string> names = curr_fcn->subfunction_names ();

    size_t sz = names.size ();
    retval.resize (sz);

    // Loop over them.
    size_t i = 0;
    for (const auto& nm : names)
      retval(i++) = nm;

    return retval;
  }


The value of curr_fcn is NULL.  You are stopped in a subfunction, so finding
the ultimate parent function should be possible.

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