[Bug 213047] dns/powerdns: fix memory leak in gpgsql backend

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213047

            Bug ID: 213047
           Summary: dns/powerdns: fix memory leak in gpgsql backend
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: mschout at gkg.net
                CC: tremere at cainites.net
                CC: tremere at cainites.net
             Flags: maintainer-feedback?(tremere at cainites.net)

Created attachment 175229
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=175229&action=edit
patch

PowerDNS v4.0.x introduced a memory leak in the gpgsql backend.  Specifically
each dns query opens a transaction by calling PQexec("BEGIN") but the returned
PGresult pointer is never freed with PQclear().

See https://github.com/PowerDNS/pdns/pull/4459

We've been using this patch in production for several days and it does in fact
fix the memory leak.  This patch should be in 4.0.2, but in the meantime its
probably a good idea to patch the port.

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