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bms_prev_member() could attempt to access memory outside of the words[] array in cases where the prevbit was a number < -1 or > a->nwords * BITS_PER_BITMAPWORD + 1. Here we add the Asserts to help draw attention to bogus callers so we're more likely to catch them during development. In passing, fix wording of bms_prev_member's header comment which talks about how we expect the callers to ensure only valid prevbit values are used. Author: Greg Burd <greg@burd.me> Reviewed-by: David Rowley <dgrowleyml@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/2000A717-1FFE-4031-827B-9330FB2E9065%40getmailspring.com
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/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/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/.