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When probing the Memoize cache to check if the current cache key values exist in the cache, we perform an evaluation of the expressions making up the cache key before probing the hash table for those values. This operation could leak memory as it is possible that the cache key is an expression which requires allocation of memory, as was the case in bug 17844. Here we fix this by correctly switching to the per tuple context before evaluating the cache expressions so that the memory is freed next time the per tuple context is reset. Bug: 17844 Reported-by: Alexey Ermakov Discussion: https://postgr.es/m/17844-d2f6f9e75a622bed@postgresql.org Backpatch-through: 14, where Memoize was introduced |
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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/.