linux-kernel - [02/45] Fix potential crash with sys_move

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Date:	Tue, 30 Mar 2010 15:48:22 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [02/45] Fix potential crash with sys_move_pages

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

------------------

From: Linus Torvalds <torvalds@...ux-foundation.org>

commit 6f5a55f1a6c5abee15a0e878e5c74d9f1569b8b0 upstream.

We incorrectly depended on the 'node_state/node_isset()' functions
testing the node range, rather than checking it explicitly.  That's not
reliable, even if it might often happen to work.  So do the proper
explicit test.

Reported-by: Marcus Meissner <meissner@...e.de>
Acked-and-tested-by: Brice Goglin <Brice.Goglin@...ia.fr>
Acked-by: Hugh Dickins <hugh.dickins@...cali.co.uk>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 mm/migrate.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1062,6 +1062,9 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid,
 				goto out;
 
 			err = -ENODEV;
+			if (node < 0 || node >= MAX_NUMNODES)
+				goto out;
+
 			if (!node_state(node, N_HIGH_MEMORY))
 				goto out;
 


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