[Bug 1935884] Re: avahi-daemon segfaults when a txt-record has no value

[Paul White]

'focal' is a release name and not the name of a
package currently in a supported release of Ubuntu.

** Changed in: focal (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1935884

Title:
  avahi-daemon segfaults when a txt-record has no value

Status in Avahi:
  Fix Released
Status in avahi package in Ubuntu:
  New
Status in focal package in Ubuntu:
  Invalid

Bug description:
  This bug is reported upstream(
  https://github.com/lathiat/avahi/issues/247 ) but ubuntu focal did not
  fix it.

  Version: avahi-daemon (0.7-4ubuntu7.1) on Focal Fossa
   
  Service XML causing the segfault:
   
  ```
  <?xml version="1.0" standalone='no'?><!--*-nxml-*-->
  <!DOCTYPE service-group SYSTEM "avahi-service.dtd">
  <service-group>
    <name replace-wildcards="yes">Printer</name>
    <service protocol="ipv4">
      <type>_ipp._tcp.</type>
      <host-name>printer.local</host-name>
      <port>631</port>
      <txt-record>note=</txt-record>
    </service>
  </service-group>
  ```
   
  The line `<txt-record>note=</txt-record>` causes avahi to segfault.
   
  The Workaround I found was: `<txt-record>note=""</txt-record>` I.e. setting the `note` to an empty string.

  It can fix to merge this ( https://github.com/lathiat/avahi/pull/226
  ).

  This bug fixed on upstream version 0.8, so this bug remains on bionic
  and focal.

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