Ticket #8724: 8724.diff

wp-admin/update-core.php

@@ -134 +134 @@
 function do_core_upgrade( $reinstall = false ) {
         global $wp_filesystem;
 
-        $url = wp_nonce_url('update-core.php?action=do-core-upgrade', 'upgrade-core');
+        if ( $reinstall )
+                $url = 'update-core.php?action=do-core-reinstall';
+        else
+                $url = 'update-core.php?action=do-core-upgrade';
+        $url = wp_nonce_url($url, 'upgrade-core');
         if ( false === ($credentials = request_filesystem_credentials($url)) )
                 return;