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    Subject[patch 18/39] [PATCH] sys_mbind sanity checking
    -stable review patch.  If anyone has any objections, please let us know.
    ------------------

    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>
    [chrisw: fix units, pointed out by Andi]
    Cc: Andi Kleen <ak@suse.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    ---

    mm/mempolicy.c | 2 ++
    1 files changed, 2 insertions(+)

    --- linux-2.6.15.4.orig/mm/mempolicy.c
    +++ linux-2.6.15.4/mm/mempolicy.c
    @@ -524,6 +524,8 @@ static int get_nodes(nodemask_t *nodes,
    nodes_clear(*nodes);
    if (maxnode == 0 || !nmask)
    return 0;
    + if (maxnode > PAGE_SIZE*BITS_PER_BYTE)
    + return -EINVAL;

    nlongs = BITS_TO_LONGS(maxnode);
    if ((maxnode % BITS_PER_LONG) == 0)
    --
    -
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