[PATCH 1/2] media: rockchip: rkcif: fix off by one bugs

[Paul Elder]

Quoting Michael Riesch (2026-02-16 22:49:56)
> From: Dan Carpenter <dan.carpenter at linaro.org>
> 
> Change these comparisons from > vs >= to avoid accessing one element
> beyond the end of the arrays.
> 
> Fixes: 1f2353f5a1af ("media: rockchip: rkcif: add support for rk3568 vicap mipi capture")
> Cc: stable at kernel.org
> Signed-off-by: Dan Carpenter <dan.carpenter at linaro.org>
> Reviewed-by: Michael Riesch <michael.riesch at collabora.com>
> Signed-off-by: Michael Riesch <michael.riesch at collabora.com>

Reviewed-by: Paul Elder <paul.elder at ideasonboard.com>

> ---
>  drivers/media/platform/rockchip/rkcif/rkcif-capture-mipi.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/platform/rockchip/rkcif/rkcif-capture-mipi.c b/drivers/media/platform/rockchip/rkcif/rkcif-capture-mipi.c
> index 1b81bcc067ef..a933df682acc 100644
> --- a/drivers/media/platform/rockchip/rkcif/rkcif-capture-mipi.c
> +++ b/drivers/media/platform/rockchip/rkcif/rkcif-capture-mipi.c
> @@ -489,8 +489,8 @@ static inline unsigned int rkcif_mipi_get_reg(struct rkcif_interface *interface,
>  
>         block = interface->index - RKCIF_MIPI_BASE;
>  
> -       if (WARN_ON_ONCE(block > RKCIF_MIPI_MAX - RKCIF_MIPI_BASE) ||
> -           WARN_ON_ONCE(index > RKCIF_MIPI_REGISTER_MAX))
> +       if (WARN_ON_ONCE(block >= RKCIF_MIPI_MAX - RKCIF_MIPI_BASE) ||
> +           WARN_ON_ONCE(index >= RKCIF_MIPI_REGISTER_MAX))
>                 return RKCIF_REGISTER_NOTSUPPORTED;
>  
>         offset = rkcif->match_data->mipi->blocks[block].offset;
> @@ -510,9 +510,9 @@ static inline unsigned int rkcif_mipi_id_get_reg(struct rkcif_stream *stream,
>         block = stream->interface->index - RKCIF_MIPI_BASE;
>         id = stream->id;
>  
> -       if (WARN_ON_ONCE(block > RKCIF_MIPI_MAX - RKCIF_MIPI_BASE) ||
> -           WARN_ON_ONCE(id > RKCIF_ID_MAX) ||
> -           WARN_ON_ONCE(index > RKCIF_MIPI_ID_REGISTER_MAX))
> +       if (WARN_ON_ONCE(block >= RKCIF_MIPI_MAX - RKCIF_MIPI_BASE) ||
> +           WARN_ON_ONCE(id >= RKCIF_ID_MAX) ||
> +           WARN_ON_ONCE(index >= RKCIF_MIPI_ID_REGISTER_MAX))
>                 return RKCIF_REGISTER_NOTSUPPORTED;
>  
>         offset = rkcif->match_data->mipi->blocks[block].offset;
> 
> -- 
> 2.39.5
> 
>