From: Andi Kleen <ak@suse.de>
Date: Tue, 21 Feb 2006 02:27:59 +0000 (-0800)
Subject: [PATCH] Fix units in mbind check
X-Git-Tag: firefly_0821_release~37937
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a9c930bac163c5e616ca0ba9378e7dc746c93227;p=firefly-linux-kernel-4.4.55.git

[PATCH] Fix units in mbind check

maxnode is a bit index and can't be directly compared against a byte length
like PAGE_SIZE

Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index bedfa4f09c80..6422fe478113 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -808,7 +808,7 @@ 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)
+	if (maxnode > PAGE_SIZE*BITS_PER_BYTE)
 		return -EINVAL;
 
 	nlongs = BITS_TO_LONGS(maxnode);