[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>
git-mirror · Feb 17, 2006 · 636f13c · 636f13c
1 parent 74910e6
commit 636f13c
Showing 1 changed file with 2 additions and 0 deletions.
diff --git 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)