ids: Make sure root ids is present in image

Here is updated one.

0001-ids-Make-sure-kIDs-is-present-in-image.patch

>From dee67b483f0ed1a6f81ebe95ae9bdf74d3ab2ad7 Mon Sep 17 00:00:00 2001
From: Cyrill Gorcunov <gorcunov@openvz.org>
Date: Fri, 15 Mar 2013 00:43:30 +0400
Subject: [PATCH 1/2] ids: Make sure kIDs is present in image

Otherwise yield error instead of nil dereference
if we meet a broken image.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

pstree.c

@@ -497,6 +497,14 @@ static int prepare_pstree_kobj_ids(void)
 		else
 			ids = root_ids;
 
+		/*
+		 * Add some sanity check on image data.
+		 */
+		if (unlikely(!ids)) {
+			pr_err("No kIDs provided, image corruption\n");
+			return -1;
+		}
+
 		cflags = get_clone_mask(item->ids, ids);
 
 		if (cflags & CLONE_FILES) {