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Subject[patch 18/39] [PATCH] sys_mbind sanity checking
-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@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>
---
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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