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

[Matthias Brugger <matthias.bgg@gmail.com>]

On 09/01/2019 06:57, Pi-Hsun Shih 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>

For the next time, please don't forget to provide a fixes tag so that it can get
into stable trees automatically.

For the records, it fixes commit (v4.9):
b7cf0053738c ("thermal: Add Mediatek thermal driver for mt2701.")


> ---
>  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 */
>