[asterisk-bugs] [JIRA] (ASTERISK-27406) Infinite loop when out of ports and rtpstart value is odd

[Asterisk Team (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-27406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Asterisk Team updated ASTERISK-27406:
-------------------------------------

    Target Release Version/s: 20.0.0

> Infinite loop when out of ports and rtpstart value is odd
> ---------------------------------------------------------
>
>                 Key: ASTERISK-27406
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-27406
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_rtp_asterisk
>    Affects Versions: 13.18.0
>            Reporter: Thomas Guebels
>            Assignee: Michael Bradeen
>            Severity: Trivial
>              Labels: patch
>      Target Release: 16.24.0, 18.10.0, 19.2.0, 20.0.0
>
>         Attachments: round_up_to_even.diff
>
>
> When the rtpstart value configured in rtp.conf parity is odd and all RTP ports are already used, the next call will start an infinite loop.
> ast_rtp_new walks through the RTP port range configured until it finds a free one. It starts at a random position, wraps around at the end of the range and return an error if it comes back to the starting position. 
> Unfortunately, this code assumes an even value was set in rtpstart since we never go back to the starting position otherwise.
> Either a correct value for rtpstart should be enforced when parsing the configuration or the port lookup should not assume anything and never fail to break the loop.



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