From: Christoph Lameter <clameter@sgi.com>

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>

---
 mm/mempolicy.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-2.6/mm/mempolicy.c
===================================================================
--- linux-2.6.orig/mm/mempolicy.c	2007-08-31 00:07:39.000000000 -0700
+++ linux-2.6/mm/mempolicy.c	2007-08-31 00:08:22.000000000 -0700
@@ -955,6 +955,11 @@ asmlinkage long sys_migrate_pages(pid_t 
 		goto out;
 	}
 
+	if (!nodes_subset(new, node_online_map)) {
+		err = -EINVAL;
+		goto out;
+	}
+
 	err = security_task_movememory(task);
 	if (err)
 		goto out;