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one argument at a time and then inserting the argument into a Python list via PyList_SetItem(). This "steals" the reference to the argument: that is, the reference to the new list member is now held by the Python list itself. This works fine, except if an elog occurs. This causes the function's PG_CATCH() block to be invoked, which decrements the reference counts on both the current argument and the list of arguments. If the elog happens to occur during the second or subsequent iteration of the loop, the reference count on the current argument will be decremented twice. The fix is simple: set the local pointer to the current argument to NULL immediately after adding it to the argument list. This ensures that the Py_XDECREF() in the PG_CATCH() block doesn't double-decrement.
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. The JDBC, ODBC, C++, Python, and Tcl interfaces have been moved to the PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate maintenance. A Perl DBI/DBD driver is available from CPAN. 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 ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.