[patch 18/39] [PATCH] sys_mbind sanity checking

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
------------------

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

Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxx>
[chrisw: fix units, pointed out by Andi]
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---

 mm/mempolicy.c |    2 ++
 1 files changed, 2 insertions(+)

--- linux-2.6.15.4.orig/mm/mempolicy.c
+++ linux-2.6.15.4/mm/mempolicy.c
@@ -524,6 +524,8 @@ static int get_nodes(nodemask_t *nodes, 
 	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)

--
-
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