0cb713b120
Commit c7aeb775 rewrote the HOT-chain offset sanity checks in three
places, but in heap_get_root_tuples it accidentally tested offnum -- the
outer loop variable, which is already bounded by the loop condition --
instead of nextoffnum, the offset actually passed to PageGetItemId. The
pre-c7aeb775 check tested nextoffnum.
With the check ineffective, a stale t_ctid could make PageGetItemId read
past the end of the line pointer array (which is data corruption that we
expect to be able to catch here).
Author: Peter Geoghegan <pg@bowt.ie>
Reported-by: Konstantin Knizhnik <knizhnik@garret.ru>
Discussion: https://postgr.es/m/87c7d8a4-3a82-4334-bee6-e8c2ad3f3293@garret.ru
Backpatch-through: 15
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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/17/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/17/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.