On Tue, Mar 28, 2023 at 09:26:08AM +0000, Wei Chen wrote:
> variable *nplanes is provided by user via system call argument. The
> possible value of q_data->fmt->num_planes is 1-3, while the value
> of *nplanes can be 1-8. The array access by index i can cause array
> out-of-bounds.
>
> Fix this bug by checking *nplanes against the array size.
This should have a fixes tag:
Fixes: 4e855a6efa54 ("[media] vcodec: mediatek: Add Mediatek V4L2 Video Encoder Driver")
And also CC the stable list:
Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Wei Chen <harperchen1110@xxxxxxxxx>
Reviewed-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>
> ---
> drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> index d65800a3b89d..1ea02f9136f6 100644
> --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> @@ -821,6 +821,8 @@ static int vb2ops_venc_queue_setup(struct vb2_queue *vq,
> return -EINVAL;
>
> if (*nplanes) {
> + if (*nplanes != q_data->fmt->num_planes)
> + return -EINVAL;
> for (i = 0; i < *nplanes; i++)
> if (sizes[i] < q_data->sizeimage[i])
> return -EINVAL;
> --
> 2.25.1
>
