[Bug 3169] New: sshd listens to port 22 AND whatever port is specified in or after Include(s)

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3169

            Bug ID: 3169
           Summary: sshd listens to port 22 AND whatever port is specified
                    in or after Include(s)
           Product: Portable OpenSSH
           Version: 8.2p1
          Hardware: amd64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: mindrot.org at choam.com

Created attachment 3396
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3396&action=edit
script to reproduce the bug

Another problem with the include functionality. A 'Port' statement
AFTER 'Include' will be accepted, BUT the server will listen to that
port AND to port 22. Note that the sshd_config as shipped does NOT have
a 'Port' statement - the server defaults to 22 if no Port is specified
(appearantly before 'Incude'(s) are evaluated.)

When I move the whole sshd_config to another name
(sshd_config_with_another_name) and include it from a new sshd_config
containing just two lines:

Include /etc/ssh/sshd_config_with_another_name
Port 7722

Then the server listens to Port 7722 AND 22.

When the order is reversed:

Port 7722
Include /etc/ssh/sshd_config_with_another_name

it will listen to port 7722 ONLY.

Previously reported to the Ubuntu people, but they referred me here.
https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1876320 . I feel
this could be something simple, but I cannot find it in the source.
Sorry.

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