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Subject: media: mediatek: jpeg: Use vb2_get_buffer() instead of directly access 
to buffers array
Author:  Benjamin Gaignard <benjamin.gaign...@collabora.com>
Date:    Thu Nov 9 17:29:23 2023 +0100

Use vb2_get_buffer() instead of direct access to the vb2_queue bufs array.
This allows us to change the type of the bufs in the future.
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.gaign...@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrze...@collabora.com>
CC: Bin Liu <bin....@mediatek.com>
CC: Matthias Brugger <matthias....@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mche...@kernel.org>

 drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

---

diff --git a/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c 
b/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
index 7194f88edc0f..73a063b1569b 100644
--- a/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
+++ b/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
@@ -598,12 +598,11 @@ static int mtk_jpeg_qbuf(struct file *file, void *priv, 
struct v4l2_buffer *buf)
                goto end;
 
        vq = v4l2_m2m_get_vq(fh->m2m_ctx, buf->type);
-       if (buf->index >= vq->num_buffers) {
-               dev_err(ctx->jpeg->dev, "buffer index out of range\n");
+       vb = vb2_get_buffer(vq, buf->index);
+       if (!vb) {
+               dev_err(ctx->jpeg->dev, "buffer not found\n");
                return -EINVAL;
        }
-
-       vb = vq->bufs[buf->index];
        jpeg_src_buf = mtk_jpeg_vb2_to_srcbuf(vb);
        jpeg_src_buf->bs_size = buf->m.planes[0].bytesused;
 

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