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Coverity complained that we weren't doing that, and it's right. This fix just makes fmtIdEnc() honor the general convention that OOM causes a PQExpBuffer to become marked "broken", without any immediate error. In the pretty-unlikely case that we actually did hit OOM here, the end result would be to return an empty string to the caller, probably resulting in invalid SQL syntax in an issued command (if nothing else went wrong, which is even more unlikely). It's tempting to throw an "out of memory" error if the buffer becomes broken, but there's not a lot of point in doing that only here and not in hundreds of other PQExpBuffer-using places in pg_dump and similar callers. The whole issue could do with some non-time-crunched redesign, perhaps. This is a followup to the fixes for CVE-2025-1094, and should be included if cherry-picking those fixes.
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/.