Re: [PATCH][next] thermal: qcom: tsens-v1: fix kfree of a non-pointer value

[Amit Kucheria]

On Tue, Oct 22, 2019 at 4:48 PM Colin King <colin.king@xxxxxxxxxxxxx> wrote:
>
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> Currently the kfree of pointer qfprom_cdata is kfreeing an
> error value that has been cast to a pointer rather than a
> valid address.  Fix this by removing the kfree.

Hmm, we just added this to other places[1] as a fix for mem leaks
using the nvmem api.

I think we need to fix up the qfprom_read wrapper. Srini?

[1] https://lore.kernel.org/stable/20191010083616.685532154@xxxxxxxxxxxxxxxxxxx/

> Fixes: 95ededc17e4e ("thermal: qcom: tsens-v1: Add support for MSM8956 and MSM8976")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> ---
>  drivers/thermal/qcom/tsens-v1.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/thermal/qcom/tsens-v1.c b/drivers/thermal/qcom/tsens-v1.c
> index 2d1077b64887..bd2ddb684a45 100644
> --- a/drivers/thermal/qcom/tsens-v1.c
> +++ b/drivers/thermal/qcom/tsens-v1.c
> @@ -240,10 +240,8 @@ static int calibrate_8976(struct tsens_priv *priv)
>         u32 *qfprom_cdata;
>
>         qfprom_cdata = (u32 *)qfprom_read(priv->dev, "calib");
> -       if (IS_ERR(qfprom_cdata)) {
> -               kfree(qfprom_cdata);
> +       if (IS_ERR(qfprom_cdata))
>                 return PTR_ERR(qfprom_cdata);
> -       }
>
>         mode = (qfprom_cdata[4] & MSM8976_CAL_SEL_MASK);
>         dev_dbg(priv->dev, "calibration mode is %d\n", mode);
> --
> 2.20.1
>