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

[Thomas Guebels (JIRA)]

Thomas Guebels created ASTERISK-27406:
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             Summary: 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


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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