Ticket #7878: 7878.2.diff

wp-admin/includes/plugin.php

@@ -215 +259 @@
  */
 function activate_plugin($plugin, $redirect = '') {
         $current = get_option('active_plugins');
-        $plugin = trim($plugin);
+        $plugin = plugin_basename(trim($plugin));
 
         $valid = validate_plugin($plugin);
         if ( is_wp_error($valid) )
@@ -254 +298 @@
                 $plugins = array($plugins);
 
         foreach ( $plugins as $plugin ) {
+                $plugin = plugin_basename($plugin);
                 if( ! is_plugin_active($plugin) )
                         continue;
                 array_splice($current, array_search( $plugin, $current), 1 ); // Fixed Array-fu!