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If you accumulate many arrays full of NULLs, you could overflow 'nitems', before reaching the MaxAllocSize limit on the allocations. Add an explicit check that the number of items doesn't grow too large. With more than MaxArraySize items, getting the final result with makeArrayResultArr() would fail anyway, so better to error out early. Reported-by: Xint Code Author: Heikki Linnakangas <heikki.linnakangas@iki.fi> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Backpatch-through: 14 Security: CVE-2026-6473
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/.