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Fix missing NULL check in MemoryContextAllocAligned(). The underlying call to MemoryContextAllocExtended() could return NULL when flags contains MCXT_ALLOC_NO_OOM and the underlying malloc fails. There are no current callers using MemoryContextAllocAligned() that pass the MCXT_ALLOC_NO_OOM in core, so no live bug fix in core here. However, an extension might use this pattern, so we'd better fix. Fix this so we correctly pass the NULL to the caller rather than trying to write to a NULL memory address. This also fixes the same bug in AlignedAllocRealloc(), which is also unused in core. Backpatch to v16, where these functions first appeared. Author: Chao Li <li.evan.chao@gmail.com> Discussion: https://postgr.es/m/07DAC4C3-120D-4F3C-8FEE-BA236F7E9C1D@gmail.com Backpatch-through: 16
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/.