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    Subject[ 17/31] media: au0828: fix case where STREAMOFF being called on stopped stream causes BUG()
    Date
    3.0-stable review patch.  If anyone has any objections, please let me know.

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

    From: Devin Heitmueller <dheitmueller@kernellabs.com>

    commit a595c1ce4c9d572cf53513570b9f1a263d7867f2 upstream.

    We weren't checking whether the resource was in use before calling
    res_free(), so applications which called STREAMOFF on a v4l2 device that
    wasn't already streaming would cause a BUG() to be hit (MythTV).

    Reported-by: Larry Finger <larry.finger@lwfinger.net>
    Reported-by: Jay Harbeston <jharbestonus@gmail.com>
    Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
    Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

    ---
    drivers/media/video/au0828/au0828-video.c | 12 ++++++++----
    1 file changed, 8 insertions(+), 4 deletions(-)

    --- a/drivers/media/video/au0828/au0828-video.c
    +++ b/drivers/media/video/au0828/au0828-video.c
    @@ -1697,14 +1697,18 @@ static int vidioc_streamoff(struct file
    (AUVI_INPUT(i).audio_setup)(dev, 0);
    }

    - videobuf_streamoff(&fh->vb_vidq);
    - res_free(fh, AU0828_RESOURCE_VIDEO);
    + if (res_check(fh, AU0828_RESOURCE_VIDEO)) {
    + videobuf_streamoff(&fh->vb_vidq);
    + res_free(fh, AU0828_RESOURCE_VIDEO);
    + }
    } else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
    dev->vbi_timeout_running = 0;
    del_timer_sync(&dev->vbi_timeout);

    - videobuf_streamoff(&fh->vb_vbiq);
    - res_free(fh, AU0828_RESOURCE_VBI);
    + if (res_check(fh, AU0828_RESOURCE_VBI)) {
    + videobuf_streamoff(&fh->vb_vbiq);
    + res_free(fh, AU0828_RESOURCE_VBI);
    + }
    }

    return 0;



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