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Fix potential crash with sys_move_pages

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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@suse.de>
Acked-and-tested-by: Brice Goglin <Brice.Goglin@inria.fr>
Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2010-02-05 16:16:50 -08:00
parent 9d9c3a51e7
commit 6f5a55f1a6
1 changed files with 3 additions and 0 deletions
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3
mm/migrate.c
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@ -912,6 +912,9 @@ static int do_pages_move(struct mm_struct *mm, struct task_struct *task,
goto out_pm;
err = -ENODEV;
if (node < 0 || node >= MAX_NUMNODES)
goto out_pm;
if (!node_state(node, N_HIGH_MEMORY))
goto out_pm;