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    Subject[PATCH 5.10 232/593] media: rkvdec: Fix .buf_prepare
    Date
    From: Ezequiel Garcia <ezequiel@collabora.com>

    [ Upstream commit ba1ed4ae760a81caf39f54232e089d95157a0dba ]

    The driver should only set the payload on .buf_prepare if the
    buffer is CAPTURE type. If an OUTPUT buffer has a zero bytesused
    set by userspace then v4l2-core will set it to buffer length.

    If we overwrite bytesused for OUTPUT buffers, too, then
    vb2_get_plane_payload() will return incorrect value which might be then
    written to hw registers by the driver in rkvdec-h264.c.

    [Changed the comment and used V4L2_TYPE_IS_CAPTURE macro]

    Fixes: cd33c830448ba ("media: rkvdec: Add the rkvdec driver")
    Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
    Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
    Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
    Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
    Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/staging/media/rkvdec/rkvdec.c | 10 +++++++++-
    1 file changed, 9 insertions(+), 1 deletion(-)

    diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
    index b630e161d4ce..e68303e2b390 100644
    --- a/drivers/staging/media/rkvdec/rkvdec.c
    +++ b/drivers/staging/media/rkvdec/rkvdec.c
    @@ -471,7 +471,15 @@ static int rkvdec_buf_prepare(struct vb2_buffer *vb)
    if (vb2_plane_size(vb, i) < sizeimage)
    return -EINVAL;
    }
    - vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
    +
    + /*
    + * Buffer's bytesused must be written by driver for CAPTURE buffers.
    + * (for OUTPUT buffers, if userspace passes 0 bytesused, v4l2-core sets
    + * it to buffer length).
    + */
    + if (V4L2_TYPE_IS_CAPTURE(vq->type))
    + vb2_set_plane_payload(vb, 0, f->fmt.pix_mp.plane_fmt[0].sizeimage);
    +
    return 0;
    }

    --
    2.30.2


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