[PATCH] get_nodes should ignore invalid node

[Shaohua Li <shaohua.li@intel.com>]

get_nodes doesn't check if nodes in node mask are valid, cause a kernel
oops when an invalid node is used..

Signed-off-by: Shaohua Li <shaohua.li@intel.com>

Index: linux/mm/mempolicy.c
===================================================================
--- linux.orig/mm/mempolicy.c	2007-07-25 09:14:33.000000000 +0800
+++ linux/mm/mempolicy.c	2007-08-21 13:15:41.000000000 +0800
@@ -850,6 +850,8 @@ static int get_nodes(nodemask_t *nodes, 
 	if (copy_from_user(nodes_addr(*nodes), nmask, nlongs*sizeof(unsigned long)))
 		return -EFAULT;
 	nodes_addr(*nodes)[nlongs-1] &= endmask;
+
+	nodes_and(*nodes, *nodes, node_online_map);
 	return 0;
 }
 
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