Comment 0 for bug 2048764

This is essentially a duplicate of Debian bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1058796

After a client connects to pure-ftpd-postgresql 1.0.50, the server establishes the TLS connection, authenticates the user and segfaults immediately after that, interrupting the connection in the process.

```
$ lsb_release -rd
Description: Ubuntu 22.04.3 LTS
Release: 22.04
```

```
$ apt-cache policy pure-ftpd-postgresql
pure-ftpd-postgresql:
  Installed: 1.0.50-2.1
  Candidate: 1.0.50-2.1
  Version table:
 *** 1.0.50-2.1 500
        500 http://cz.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages
        100 /var/lib/dpkg/status
```

```
Jan 9 10:26:42 info pure-ftpd-postgresql[497741]: Running: /usr/sbin/pure-ftpd-postgresql -l pgsql:/etc/pure-ftpd/db/postgresql.conf -A -D -J ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384 -H -Y 1 -O clf:/var/log/pure-ftpd/transfer.log -u 1 -b -E -p 40000:49999 -B
Jan 9 10:26:42 info systemd[1]: Started pure-ftpd-postgresql.service.
Jan 9 10:26:52 info kernel: [347086.735293] pure-ftpd-postg[497765]: segfault at 1538 ip 00007f4f4dbb1ebc sp 00007ffe6df88698 error 4 in libc.so.6[7f4f4da28000+195000] likely on CPU 6 (core 3, socket 0)
Jan 9 10:26:52 info kernel: [347086.735338] Code: 00 00 00 00 00 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 89 f8 62 a1 fd 00 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 34 01 00 00 <62> f3 7d 20 3f 07 00 c5 fb 93 c0 85 c0 74 55 f3 0f bc c0 c3 f3 0f
Jan 9 10:26:57 info kernel: [347091.872524] pure-ftpd-postg[497779]: segfault at 1538 ip 00007f4f4dbb1ebc sp 00007ffe6df88698 error 4 in libc.so.6[7f4f4da28000+195000] likely on CPU 6 (core 3, socket 0)
Jan 9 10:26:57 info kernel: [347091.872562] Code: 00 00 00 00 00 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 89 f8 62 a1 fd 00 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 34 01 00 00 <62> f3 7d 20 3f 07 00 c5 fb 93 c0 85 c0 74 55 f3 0f bc c0 c3 f3 0f
Jan 9 10:36:24 info kernel: [347659.224784] pure-ftpd-postg[498601]: segfault at 1538 ip 00007f4f4dbb1ebc sp 00007ffe6df88698 error 4 in libc.so.6[7f4f4da28000+195000] likely on CPU 4 (core 2, socket 0)
Jan 9 10:36:24 info kernel: [347659.224806] Code: 00 00 00 00 00 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 89 f8 62 a1 fd 00 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 34 01 00 00 <62> f3 7d 20 3f 07 00 c5 fb 93 c0 85 c0 74 55 f3 0f bc c0 c3 f3 0f
Jan 9 10:36:30 info kernel: [347665.416357] pure-ftpd-postg[498611]: segfault at 1538 ip 00007f4f4dbb1ebc sp 00007ffe6df88698 error 4 in libc.so.6[7f4f4da28000+195000] likely on CPU 4 (core 2, socket 0)
Jan 9 10:36:30 info kernel: [347665.416396] Code: 00 00 00 00 00 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 89 f8 62 a1 fd 00 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 34 01 00 00 <62> f3 7d 20 3f 07 00 c5 fb 93 c0 85 c0 74 55 f3 0f bc c0 c3 f3 0f
```

The bug is already fixed in upstream via https://github.com/jedisct1/pure-ftpd/commit/c3f0f3c91d86939e6fabf5f65c6c6fc964e6032e