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The chr() function used PG_GETARG_UINT32() even though the argument is declared as (signed) integer. As a result, you can pass negative arguments to this function and it internally interprets them as positive. Ultimately ends up being harmless, but it seems wrong, so fix this and rearrange the internal error checking a bit to accommodate this. Another case was in the documentation, where example code used PG_GETARG_UINT32() with an argument declared as signed integer. Reviewed-by: Nathan Bossart <bossartn@amazon.com> Discussion: https://www.postgresql.org/message-id/flat/7e43869b-d412-8f81-30a3-809783edc9a3%40enterprisedb.com
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/.