Re: [PATCH] thermal: mtk: Allocate enough space for mtk_thermal.

[Peter Shih <pihsun@chromium.org>]

Adding Michael Kao to cc list.

On Wed, Jan 9, 2019 at 1:57 PM Pi-Hsun Shih <pihsun@chromium.org> wrote:
>
> The mtk_thermal struct contains a 'struct mtk_thermal_bank banks[];',
> but the allocation only allocates sizeof(struct mtk_thermal) bytes,
> which cause out of bound access with the ->banks[] member. Change it to
> a fixed size array instead.
>
> Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org>
> ---
>  drivers/thermal/mtk_thermal.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
> index 0691f260f6eabe..ea11edb3fcced6 100644
> --- a/drivers/thermal/mtk_thermal.c
> +++ b/drivers/thermal/mtk_thermal.c
> @@ -159,6 +159,9 @@
>  #define MT7622_NUM_SENSORS_PER_ZONE    1
>  #define MT7622_TS1     0
>
> +/* The maximum number of banks */
> +#define MAX_NUM_ZONES          8
> +
>  struct mtk_thermal;
>
>  struct thermal_bank_cfg {
> @@ -178,7 +181,7 @@ struct mtk_thermal_data {
>         const int *sensor_mux_values;
>         const int *msr;
>         const int *adcpnp;
> -       struct thermal_bank_cfg bank_data[];
> +       struct thermal_bank_cfg bank_data[MAX_NUM_ZONES];
>  };
>
>  struct mtk_thermal {
> @@ -197,7 +200,7 @@ struct mtk_thermal {
>         s32 vts[MT8173_NUM_SENSORS];
>
>         const struct mtk_thermal_data *conf;
> -       struct mtk_thermal_bank banks[];
> +       struct mtk_thermal_bank banks[MAX_NUM_ZONES];
>  };
>
>  /* MT8173 thermal sensor data */
> --
> 2.20.1.97.g81188d93c3-goog
>