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    Subject[patch 05/19] apci: fix NULL deref in video/lcd/brightness
    -stable review patch.  If anyone has any objections, please let us know.

    ------------------
    From: Yu Luming <luming.yu@gmail.com>

    Fix Null pointer deref in video/lcd/brightness
    http://bugzilla.kernel.org/show_bug.cgi?id=5571

    Signed-off-by: Yu Luming <luming.yu@gmail.com>
    Cc: "Brown, Len" <len.brown@intel.com>
    Signed-off-by: Thomas Renninger <trenn@suse.de>
    Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
    Signed-off-by: Andrew Morton <akpm@osdl.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    Signed-off-by: Chris Wright <chrisw@redhat.com>
    ---
    drivers/acpi/video.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- linux-2.6.14.4.orig/drivers/acpi/video.c
    +++ linux-2.6.14.4/drivers/acpi/video.c
    @@ -813,7 +813,7 @@ acpi_video_device_write_brightness(struc

    ACPI_FUNCTION_TRACE("acpi_video_device_write_brightness");

    - if (!dev || count + 1 > sizeof str)
    + if (!dev || !dev->brightness || count + 1 > sizeof str)
    return_VALUE(-EINVAL);

    if (copy_from_user(str, buffer, count))
    --
    -
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