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Tom Lane 2a4c46e0ba Fix array overrun in regex code. 
zaptreesubs() was coded to unconditionally reset a capture subre's
corresponding pmatch[] entry.  However, in regexes without backrefs, that
array is caller-supplied and might not have as many entries as the regex
has capturing parens.  So check the array length and do nothing if there
is no corresponding entry, much as subset() does.  Failure to check this
resulted in a stack clobber in the case reported by Marko Kreen.

This bug appears to have been latent in the regex library from the
beginning.  It was not exposed because find() called dissect() not
cdissect(), and the dissect() code path didn't ever call zaptreesubs()
(formerly zapmem()).  When I unified dissect() and cdissect() in commit
4dd78bf37a, the problem was exposed.

Now that I've seen this, I'm rather suspicious that we might need to
back-patch it; but will refrain for now, for lack of evidence that
the case can be hit in the previous coding.
2012-05-24 13:56:16 -04:00
config Put back AC_REQUIRE([AC_STRUCT_TM]). 2012-05-14 23:06:48 -04:00
contrib Adjust pg_upgrade to output a separate log file for pg_ctl output on 2012-05-23 20:19:34 -04:00
doc Update SQL key word list to SQL:2011 2012-05-24 20:06:25 +03:00
src Fix array overrun in regex code. 2012-05-24 13:56:16 -04:00
.gitignore Add gitignore for mingw/cygwin build outputs 2011-06-09 18:11:47 +02:00
aclocal.m4 Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
configure Put back AC_REQUIRE([AC_STRUCT_TM]). 2012-05-14 23:06:48 -04:00
configure.in Remove unused AC_DEFINE symbols 2012-05-14 22:51:21 +03:00
COPYRIGHT Update copyright notices for year 2012. 2012-01-01 18:01:58 -05:00
GNUmakefile.in Add isolation test to check-world and installcheck-world 2012-03-05 20:19:20 +02:00
Makefile Allow make check in PL directories 2011-02-15 06:52:12 +02:00
README Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00
README.git Trivial typo fix. 2010-09-21 14:16:00 -04:00

README 

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	http://www.postgresql.org/download

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Changes between all PostgreSQL releases are recorded in the
file HISTORY.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
http://www.postgresql.org/download/.  For more information look at our
web site located at http://www.postgresql.org/.