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

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Date:   Tue, 19 Sep 2023 11:31:26 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        mchehab@...nel.org, tfiga@...omium.org, m.szyprowski@...sung.com,
        ming.qian@....com, ezequiel@...guardiasur.com.ar,
        p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        nicolas.dufresne@...labora.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        kernel@...labora.com
Subject: Re: [PATCH v7 07/49] media: sti: hva: Use vb2_get_buffer() instead of
 directly access to buffers array

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@...labora.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;
>  	}