linux-kernel - [PATCH] get_nodes should ignore invalid node

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Message-Id: <1187748434.8474.20.camel@sli10-conroe.sh.intel.com>
Date:	Wed, 22 Aug 2007 10:07:14 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, clameter@....com
Subject: [PATCH] get_nodes should ignore invalid node

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@...el.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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