From: Chris Wright <chrisw@sous-sol.org>
Date: Fri, 17 Feb 2006 21:59:36 +0000 (-0800)
Subject: [PATCH] sys_mbind sanity checking
X-Git-Tag: v2.6.15.5~22
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99e1baf86ff6a31330ff0c7bb77110338f03ddc5;p=thirdparty%2Fkernel%2Fstable.git

[PATCH] sys_mbind sanity checking

Make sure maxnodes is safe size before calculating nlongs in
get_nodes().

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
[chrisw: fix units, pointed out by Andi]
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 72f402cc9c9af..6e870ba707c7e 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -524,6 +524,8 @@ static int get_nodes(nodemask_t *nodes, unsigned long __user *nmask,
 	nodes_clear(*nodes);
 	if (maxnode == 0 || !nmask)
 		return 0;
+	if (maxnode > PAGE_SIZE*BITS_PER_BYTE)
+		return -EINVAL;
 
 	nlongs = BITS_TO_LONGS(maxnode);
 	if ((maxnode % BITS_PER_LONG) == 0)