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The function in charge of freeing the memory from a result created by PQescapeIdentifier() has to be PQfreemem(), to ensure that both allocation and free come from libpq. One spot in pg_upgrade was not respecting that for pg_database's datlocale (daticulocale in v16) when the collation provider is libc (aka datlocale/daticulocale is NULL) with an allocation done using pg_strdup() and a free with PQfreemem(). The code is changed to always use PQescapeLiteral() when processing the input. Oversight in 9637badd9f92. This commit is similar to 48e4ae9a0707 and 5b94e2753439. Author: Michael Paquier <michael@paquier.xyz> Co-authored-by: Ranier Vilela <ranier.vf@gmail.com> Discussion: https://postgr.es/m/Z601RQxTmIUohdkV@paquier.xyz Backpatch-through: 16
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: https://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. 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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.