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When we implemented \if ... \endif in psql, we arranged to
save/restore the lexer's parenthesis depth counter across any chunk
of input that we're ignoring. At the time, that was sufficient,
because no other part of PsqlScanState could need to be restored to
its prior value. However, commit e717a9a18 and follow-ons added
more state fields that ought to be restored to their prior values.
A problem would only be observed if someone tries to \if out a
portion of a CREATE FUNCTION/PROCEDURE command that is relevant to
BEGIN/END matching, which seems like a pretty unusual usage, so the
lack of field reports isn't surprising. Nonetheless it's a bug.
To fix, replace the simple counter field in ConditionalStack
entries with a pointer to a struct defined by psqlscan_int.h.
(In the back branches, keep the old field and associated functions
to minimize the risk of API/ABI breakage, even though it seems
unlikely that any third-party code is using this. Making the
new struct private to psqlscan-related code should prevent API/ABI
issues for future additions of this type.)
In itself this is only a minor bug fix, but it's prerequisite
infrastructure for the fix for CVE-2026-6464, which will add
another such field.
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Noah Misch <noah@leadboat.com>
Backpatch-through: 14
Security: CVE-2026-6464
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/.