This bug was fixed in the package postgresql-8.3 - 8.3.17-0ubuntu0.8.04.1

---------------
postgresql-8.3 (8.3.17-0ubuntu0.8.04.1) hardy-proposed; urgency=low

  * Add 00git_inet_cidr_unpack.patch: Revert the behavior of inet/cidr
    functions to not unpack the arguments. This fixes the memory leak when
    sorting inet values. Patch taken from upstream git HEAD. Spotted during
    testing in LP #904631.

postgresql-8.3 (8.3.17-0ubuntu0.8.04) hardy-proposed; urgency=low

  * New upstream bug fix release: (LP: #904631)
    - Fix bugs in information_schema.referential_constraints view.
      This view was being insufficiently careful about matching the
      foreign-key constraint to the depended-on primary or unique key
      constraint. That could result in failure to show a foreign key
      constraint at all, or showing it multiple times, or claiming that
      it depends on a different constraint than the one it really does.
      Since the view definition is installed by initdb, merely upgrading
      will not fix the problem. If you need to fix this in an existing
      installation, you can (as a superuser) drop the information_schema
      schema then re-create it by sourcing
      "SHAREDIR/information_schema.sql". (Run pg_config --sharedir if
      you're uncertain where "SHAREDIR" is.) This must be repeated in
      each database to be fixed.
    - Fix TOAST-related data corruption during CREATE TABLE dest AS
      SELECT - FROM src or INSERT INTO dest SELECT * FROM src.
      If a table has been modified by "ALTER TABLE ADD COLUMN", attempts
      to copy its data verbatim to another table could produce corrupt
      results in certain corner cases. The problem can only manifest in
      this precise form in 8.4 and later, but we patched earlier versions
      as well in case there are other code paths that could trigger the
      same bug.
    - Fix race condition during toast table access from stale syscache
      entries. The typical symptom was transient errors like "missing chunk
      number 0 for toast value NNNNN in pg_toast_2619", where the cited toast
      table would always belong to a system catalog.
    - Make DatumGetInetP() unpack inet datums that have a 1-byte header,
      and add a new macro, DatumGetInetPP(), that does not.
    - Improve locale support in money type's input and output.
      Aside from not supporting all standard lc_monetary formatting
      options, the input and output functions were inconsistent, meaning
      there were locales in which dumped money values could not be
      re-read.
    - Don't let transform_null_equals affect CASE foo WHEN NULL ...
      constructs.
    - Change foreign-key trigger creation order to better support
      self-referential foreign keys.
    - Avoid floating-point underflow while tracking buffer allocation
      rate.
    - Preserve blank lines within commands in psql's command history.
      The former behavior could cause problems if an empty line was
      removed from within a string literal, for example.
    - Fix pg_dump to dump user-defined casts between auto-generated
      types, such as table rowtypes.
    - Use the preferred version of xsubpp to build PL/Perl, not
      necessarily the operating system's main copy.
    - Fix incorrect coding in "contrib/dict_int" and "contrib/dict_xsyn".
    - Honor query cancel interrupts promptly in pgstatindex().
    - Ensure VPATH builds properly install all server header files.
    - Shorten file names reported in verbose error messages.
      Regular builds have always reported just the name of the C file
      containing the error message call, but VPATH builds formerly
      reported an absolute path name.
 -- Martin Pitt <email address hidden>   Thu, 05 Jan 2012 13:46:11 +0100