From 2a31f6dbd7c63232918d175fb2879682217946ea Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <alec@alec.pl>
Date: Wed, 25 Feb 2015 21:08:16 +0100
Subject: [PATCH] Reset default db_max_allowed_packet, fix max packet size
 detection

---
 config/defaults.inc.php                      | 2 +-
 program/lib/Roundcube/rcube_cache.php        | 6 ++++--
 program/lib/Roundcube/rcube_cache_shared.php | 6 ++++--
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/config/defaults.inc.php b/config/defaults.inc.php
index edc5b32df..50c392db3 100644
--- a/config/defaults.inc.php
+++ b/config/defaults.inc.php
@@ -55,7 +55,7 @@ $config['db_table_dsn'] = array(
 // Use them if your server is not MySQL or for better performance.
 // For example Roundcube uses max_allowed_packet value (in bytes)
 // which limits query size for database cache operations.
-$config['db_max_allowed_packet'] = 23423440;
+$config['db_max_allowed_packet'] = null;
 
 
 // ----------------------------------
diff --git a/program/lib/Roundcube/rcube_cache.php b/program/lib/Roundcube/rcube_cache.php
index 52a2db997..303abdac4 100644
--- a/program/lib/Roundcube/rcube_cache.php
+++ b/program/lib/Roundcube/rcube_cache.php
@@ -605,8 +605,10 @@ class rcube_cache
             $this->max_packet = 2097152; // default/max is 2 MB
 
             if ($this->type == 'db') {
-                $value = $this->db->get_variable('max_allowed_packet', $this->max_packet);
-                $this->max_packet = max($value, $this->max_packet) - 2000;
+                if ($value = $this->db->get_variable('max_allowed_packet', $this->max_packet)) {
+                    $this->max_packet = $value;
+                }
+                $this->max_packet -= 2000;
             }
             else if ($this->type == 'memcache') {
                 $stats = $this->db->getStats();
diff --git a/program/lib/Roundcube/rcube_cache_shared.php b/program/lib/Roundcube/rcube_cache_shared.php
index 339a9aa20..3f0f20e41 100644
--- a/program/lib/Roundcube/rcube_cache_shared.php
+++ b/program/lib/Roundcube/rcube_cache_shared.php
@@ -595,8 +595,10 @@ class rcube_cache_shared
             $this->max_packet = 2097152; // default/max is 2 MB
 
             if ($this->type == 'db') {
-                $value = $this->db->get_variable('max_allowed_packet', 1048500);
-                $this->max_packet = min($value, $this->max_packet) - 2000;
+                if ($value = $this->db->get_variable('max_allowed_packet', $this->max_packet)) {
+                    $this->max_packet = $value;
+                }
+                $this->max_packet -= 2000;
             }
             else if ($this->type == 'memcache') {
                 $stats = $this->db->getStats();