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    Subject[2.6.20.21 review 21/35] V4L: cx88: Avoid a NULL pointer dereference during mpeg_open()
    (cherry picked from commit 48200baeab95fd39a7f4c4f3536c7142a64ac335)

    [PATCH] V4L: cx88: Avoid a NULL pointer dereference during mpeg_open()

    Bug: With a hardware encoder board installed as cx88[1] and a
    non-encoder boards installed as cx88[0], an OOPS is generated
    during cx8802_get_device() called from mpeg_open().

    Signed-off-by: Steven Toth <stoth@hauppauge.com>
    Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
    Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    ---
    drivers/media/video/cx88/cx88-mpeg.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    Index: 2.6/drivers/media/video/cx88/cx88-mpeg.c
    ===================================================================
    --- 2.6.orig/drivers/media/video/cx88/cx88-mpeg.c
    +++ 2.6/drivers/media/video/cx88/cx88-mpeg.c
    @@ -556,7 +556,7 @@ struct cx8802_dev * cx8802_get_device(st

    list_for_each(list,&cx8802_devlist) {
    h = list_entry(list, struct cx8802_dev, devlist);
    - if (h->mpeg_dev->minor == minor)
    + if (h->mpeg_dev && h->mpeg_dev->minor == minor)
    return h;
    }

    --
    -
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