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

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Date:   Tue, 22 Oct 2019 14:39:42 +0200
From:   AngeloGioacchino Del Regno <kholk11@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Amit Kucheria <amit.kucheria@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-pm@...r.kernel.org, MSM <linux-arm-msm@...r.kernel.org>,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] thermal: qcom: tsens-v1: fix kfree of a non-pointer value

Il giorno mar 22 ott 2019 alle ore 13:18 Colin King
<colin.king@...onical.com> ha scritto:
>
> From: Colin Ian King <colin.king@...onical.com>
>
> 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.
>
> Fixes: 95ededc17e4e ("thermal: qcom: tsens-v1: Add support for MSM8956 and MSM8976")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  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
>

I confirm that was one stupid mistake. I was about to send the same patch, and I
can confirm that this fix is working. Tested on my Xperia X Compact.

Tested-by: AngeloGioacchino Del Regno <kholk11@...il.com>