From f3d41b7b38e53b8d6e491dc191b7f2b0b4fa56d6 Mon Sep 17 00:00:00 2001
From: Michael Adams <mda@blogwaffe.com>
Date: Wed, 6 May 2015 21:50:29 +0000
Subject: [PATCH] Upgrade: Ensure unintelligible DB schemas don't result in
 content loss.

Merge of [32417] to the 4.2 branch.

See #32165.

Props ocean90.

Built from https://develop.svn.wordpress.org/branches/4.2@32418


git-svn-id: http://core.svn.wordpress.org/branches/4.2@32388 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-admin/includes/upgrade.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wp-admin/includes/upgrade.php b/wp-admin/includes/upgrade.php
index e43706acf2..34148f3eee 100644
--- a/wp-admin/includes/upgrade.php
+++ b/wp-admin/includes/upgrade.php
@@ -1469,7 +1469,7 @@ function upgrade_422() {
 			);
 		}
 
-		if ( 'byte' !== $content_length['type'] ) {
+		if ( 'byte' !== $content_length['type'] || 0 === $content_length['length'] ) {
 			// Sites with malformed DB schemas are on their own.
 			return;
 		}