From 3b42d28b2a04b3c9830eb865288239d45eccc402 Mon Sep 17 00:00:00 2001
From: Christoph Lameter
Date: Fri, 31 Aug 2007 00:12:08 -0700
Subject: Page migration: Do not accept invalid nodes in the target nodeset

Page migration currently does not check if the target of the move contains
nodes that that are invalid (if root attempts to migrate pages)
and may try to allocate from invalid nodes if these are specified
leading to oopses.

Return -EINVAL if an offline node is specified.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Shaohua Li <shaohua.li@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/mempolicy.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 172abffeb2e3..bb54b88c3d5a 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -955,6 +955,11 @@ asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode,
 		goto out;
 	}
 
+	if (!nodes_subset(new, node_online_map)) {
+		err = -EINVAL;
+		goto out;
+	}
+
 	err = security_task_movememory(task);
 	if (err)
 		goto out;
-- 
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