bug#46709: 28.0.50; Emacs crash in gnutls_handshake

[Robert Pluim]

>>>>> On Wed, 24 Feb 2021 17:55:58 +0100, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Robert Pluim <rpluim@gmail.com> writes:
    >> My reading of
    >> <https://gnutls.org/manual/gnutls.html#gnutls_005fhandshake> is that
    >> after receiving a fatal error, we should not call gnutls_handshake
    >> again. Iʼve tested the following patch successfully. We currently
    >> check only for GNUTLS_E_INTERRUPTED, but the list of non-fatal error
    >> codes is more than that, so perhaps more is needed.
    >> 
    >> diff --git a/src/gnutls.c b/src/gnutls.c
    >> index aa245ee5c3..4d5a909db0 100644
    >> --- a/src/gnutls.c
    >> +++ b/src/gnutls.c
    >> @@ -625,6 +625,8 @@ gnutls_try_handshake (struct Lisp_Process *proc)
    >> 
    >> while ((ret = gnutls_handshake (state)) < 0)
    >> {
    >> +      if (gnutls_error_is_fatal (ret))
    >> +        return emacs_gnutls_handle_error (state, ret);

    Lars> Yes, I think that this looks like the correct fix here.

Except now the test suite fails. Back to the drawing board.

Robert