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>E.175. Release 8.0.21</A
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><P
><B
>Release date: </B
>2009-03-16</P
></DIV
><P
>   This release contains a variety of fixes from 8.0.20.
   For information about new features in the 8.0 major release, see
   <A
HREF="release-8-0.html"
>Section E.196</A
>.
  </P
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>E.175.1. Migration to Version 8.0.21</A
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><P
>    A dump/restore is not required for those running 8.0.X.
    However, if you are upgrading from a version earlier than 8.0.6,
    see <A
HREF="release-8-0-6.html"
>Section E.190</A
>.
   </P
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>E.175.2. Changes</A
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><LI
><P
>      Prevent error recursion crashes when encoding conversion fails (Tom)
     </P
><P
>      This change extends fixes made in the last two minor releases for
      related failure scenarios.  The previous fixes were narrowly tailored
      for the original problem reports, but we have now recognized that
      <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>any</I
></SPAN
> error thrown by an encoding conversion function could
      potentially lead to infinite recursion while trying to report the
      error.  The solution therefore is to disable translation and encoding
      conversion and report the plain-ASCII form of any error message,
      if we find we have gotten into a recursive error reporting situation.
      (CVE-2009-0922)
     </P
></LI
><LI
><P
>      Disallow <TT
CLASS="COMMAND"
>CREATE CONVERSION</TT
> with the wrong encodings
      for the specified conversion function (Heikki)
     </P
><P
>      This prevents one possible scenario for encoding conversion failure.
      The previous change is a backstop to guard against other kinds of
      failures in the same area.
     </P
></LI
><LI
><P
>      Fix core dump when <CODE
CLASS="FUNCTION"
>to_char()</CODE
> is given format codes that
      are inappropriate for the type of the data argument (Tom)
     </P
></LI
><LI
><P
>      Add <TT
CLASS="LITERAL"
>MUST</TT
> (Mauritius Island Summer Time) to the default list
      of known timezone abbreviations (Xavier Bugaud)
     </P
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