Re: [PATCH v7 07/49] media: sti: hva: Use vb2_get_buffer() instead of directly access to buffers array

Hans Verkuil
2023-09-19T09:31:31Z

On 14/09/2023 15:32, Benjamin Gaignard wrote:
> Use vb2_get_buffer() instead of directly access to vb2_buffer buffer array.
> This could allow to change the type bufs[] field of vb2_buffer structure if
> needed.
> After each call to vb2_get_buffer() we need to be sure that we get
> a valid pointer so check the return value of all of them.
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> ---
> drivers/media/platform/st/sti/hva/hva-v4l2.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/media/platform/st/sti/hva/hva-v4l2.c b/drivers/media/platform/st/sti/hva/hva-v4l2.c
> index 3a848ca32a0e..326be09bdb55 100644
> --- a/drivers/media/platform/st/sti/hva/hva-v4l2.c
> +++ b/drivers/media/platform/st/sti/hva/hva-v4l2.c
> @@ -577,6 +577,10 @@ static int hva_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
> }

Above this line there is a buf->index check...

>
> vb2_buf = vb2_get_buffer(vq, buf->index);
> + if (!vb2_buf) {
> + dev_dbg(dev, "%s buffer index %d not found\n", ctx->name, buf->index);
> + return -EINVAL;
> + }

...I think that check can be dropped since vb2_get_buffer checks that already.

Regards,

Hans

> stream = to_hva_stream(to_vb2_v4l2_buffer(vb2_buf));
> stream->bytesused = buf->bytesused;
> }