[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>

1 files changed, 2 insertions, 0 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 323fdcf128c4..bedfa4f09c80 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -808,6 +808,8 @@ static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask,
         nodes_clear(*nodes);
         if (maxnode == 0 || !nmask)
                 return 0;
+        if (maxnode > PAGE_SIZE)
+                return -EINVAL;
 
         nlongs = BITS_TO_LONGS(maxnode);
         if ((maxnode % BITS_PER_LONG) == 0)