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

[Friendly Automation (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-27406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=257271#comment-257271 ] 

Friendly Automation commented on ASTERISK-27406:
------------------------------------------------

Change 17613 merged by Friendly Automation:
res_rtp_asterisk: Addressing possible rtp range issues

[https://gerrit.asterisk.org/c/asterisk/+/17613|https://gerrit.asterisk.org/c/asterisk/+/17613]

> 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
>         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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