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4f1d33d707
After a query cancel, the tail end of ExecQueryAndProcessResults took care to clear any not-yet-read PGresults; but it forgot about the one it has already read. There would only be such a result when handling a multi-command string made with "\;", so that you'd have to cancel an earlier command in such a string to reach the bug at all. Even then, there would only be leakage of a single PGresult per cancel, so it's not surprising nobody noticed this. But a leak is a leak. Noted while re-reviewing 90f517821, but this is independent of that: it dates to 7844c9918. Back-patch to v15 where that came in.
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/.