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References: <20190109055724.184692-1-pihsun@chromium.org>
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From:   Peter Shih <pihsun@chromium.org>
Date:   Wed, 30 Jan 2019 14:04:40 +0800
Message-ID: <CANdKZ0fRckMSUwHyChgBw162cVQe9_mnd_G9vwt=+CV+Y0WFfw@mail.gmail.com>
Subject: Re: [PATCH] thermal: mtk: Allocate enough space for mtk_thermal.
Cc:     Zhang Rui <rui.zhang@intel.com>,
        Eduardo Valentin <edubezval@gmail.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        "open list:THERMAL" <linux-pm@vger.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@lists.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>,
        open list <linux-kernel@vger.kernel.org>,
        Michael.Kao@mediatek.com
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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
>