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Michael Paquier 3191a593d6 Fix use-after-free in pgstat_fetch_stat_backend_by_pid()
stats_fetch_consistency set to "snapshot" causes the backend entry
"beentry" retrieved by pgstat_get_beentry_by_proc_number() to be reset
at the beginning of pgstat_fetch_stat_backend() when fetching the
backend pgstats entry.  As coded, "beentry" was being accessed after
being freed.  This commit moves all the accesses to "beentry" to happen
before calling pgstat_fetch_stat_backend(), fixing the problem.

This problem could be reached by calling the SQL functions
pg_stat_get_backend_io() or pg_stat_get_backend_wal().

Issue caught by valgrind.

Reported-by: Alexander Lakhin <exclusion@gmail.com>
Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://postgr.es/m/f1788cc0-253a-4a3a-aee0-1b8ab9538736@gmail.com
2025-04-07 09:51:40 +09:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Compute CRC32C using AVX-512 instructions where available 2025-04-06 14:04:30 +07:00
contrib Fix memory leaks in px_crypt_shacrypt(). 2025-04-06 11:57:22 -04:00
doc doc: Clarify project naming 2025-04-07 00:03:18 +02:00
src Fix use-after-free in pgstat_fetch_stat_backend_by_pid() 2025-04-07 09:51:40 +09:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml aio: Add io_method=io_uring 2025-03-26 19:49:13 -04:00
.cirrus.yml ci: Test NetBSD and OpenBSD 2025-02-12 09:40:07 -05:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
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.git-blame-ignore-revs Add commit e1a8b1ad58 to .git-blame-ignore-revs. 2025-04-04 09:41:59 -05:00
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.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
.mailmap Add a Git .mailmap file 2024-11-05 13:56:02 +01:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Compute CRC32C using AVX-512 instructions where available 2025-04-06 14:04:30 +07:00
configure.ac Compute CRC32C using AVX-512 instructions where available 2025-04-06 14:04:30 +07:00
COPYRIGHT Update copyright for 2025 2025-01-01 11:21:55 -05:00
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HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Remove AIX support 2024-02-28 15:17:23 +04:00
meson_options.txt aio: Add liburing dependency 2025-03-26 19:45:32 -04:00
meson.build Compute CRC32C using AVX-512 instructions where available 2025-04-06 14:04:30 +07:00
README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00

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/.