From 071030b79309f2b64dcd774f13ce8e5eea432a37 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov@git.wordpress.org>
Date: Wed, 20 Nov 2019 13:40:39 +0000
Subject: [PATCH] Options, Meta APIs: Avoid a race condition causing the first
 of two subsequent requests updating different options at the same time to
 lose changes.

Every time an autoloaded option is updated or deleted, the `alloptions` cache is similarly updated. Due to the race condition, on any autoloaded option being updated, every other autoloaded option had its value set to the value at load time, causing a mismatch between the data in the persistent cache and the database.

This change introduces a `$force_cache` parameter for `wp_load_alloptions()` to force an update of the local `alloptions` cache from the persistent cache when an option is added, updated, or deleted, to minimize the chance of affecting other options.

Props fabifott, rmccue, tollmanz, johnjamesjacoby, spacedmonkey, dd32, jipmoors, tellyworth, jeremyclarke, joehoyle, boonebgorges, danielbachhuber, flixos90, jeichorn, mihdan, Grzegorz.Janoszka, SergeyBiryukov.
See #31245.

git-svn-id: https://develop.svn.wordpress.org/trunk@46753 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/option.php | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/wp-includes/option.php b/src/wp-includes/option.php
index 3620064c17..406ff6ac91 100644
--- a/src/wp-includes/option.php
+++ b/src/wp-includes/option.php
@@ -189,16 +189,19 @@ function form_option( $option ) {
  * Loads and caches all autoloaded options, if available or all options.
  *
  * @since 2.2.0
+ * @since 5.4.0 The `$force_cache` parameter was added.
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *
+ * @param bool $force_cache Optional. Whether to force an update of the local cache
+ *                          from the persistent cache. Default false.
  * @return array List of all options.
  */
-function wp_load_alloptions() {
+function wp_load_alloptions( $force_cache = false ) {
 	global $wpdb;
 
 	if ( ! wp_installing() || ! is_multisite() ) {
-		$alloptions = wp_cache_get( 'alloptions', 'options' );
+		$alloptions = wp_cache_get( 'alloptions', 'options', $force_cache );
 	} else {
 		$alloptions = false;
 	}
@@ -397,7 +400,7 @@ function update_option( $option, $value, $autoload = null ) {
 	}
 
 	if ( ! wp_installing() ) {
-		$alloptions = wp_load_alloptions();
+		$alloptions = wp_load_alloptions( true );
 		if ( isset( $alloptions[ $option ] ) ) {
 			$alloptions[ $option ] = $serialized_value;
 			wp_cache_set( 'alloptions', $alloptions, 'options' );
@@ -505,7 +508,7 @@ function add_option( $option, $value = '', $deprecated = '', $autoload = 'yes' )
 
 	if ( ! wp_installing() ) {
 		if ( 'yes' == $autoload ) {
-			$alloptions            = wp_load_alloptions();
+			$alloptions            = wp_load_alloptions( true );
 			$alloptions[ $option ] = $serialized_value;
 			wp_cache_set( 'alloptions', $alloptions, 'options' );
 		} else {
@@ -583,7 +586,7 @@ function delete_option( $option ) {
 	$result = $wpdb->delete( $wpdb->options, array( 'option_name' => $option ) );
 	if ( ! wp_installing() ) {
 		if ( 'yes' == $row->autoload ) {
-			$alloptions = wp_load_alloptions();
+			$alloptions = wp_load_alloptions( true );
 			if ( is_array( $alloptions ) && isset( $alloptions[ $option ] ) ) {
 				unset( $alloptions[ $option ] );
 				wp_cache_set( 'alloptions', $alloptions, 'options' );