Re: [PATCH] thermal/drivers/exynos: Fix NULL pointer dereference when getting the critical temp

From: Marek Szyprowski <m.szyprowski@samsung.com>
To: Daniel Lezcano <daniel.lezcano@linaro.org>, rafael@kernel.org
Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
	Amit Kucheria <amitk@kernel.org>, Zhang Rui <rui.zhang@intel.com>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	"open list:SAMSUNG THERMAL DRIVER" <linux-pm@vger.kernel.org>,
	"open list:SAMSUNG THERMAL DRIVER"
	<linux-samsung-soc@vger.kernel.org>,
	"moderated list:ARM/SAMSUNG S3C,
	S5P AND EXYNOS ARM ARCHITECTURES"
	<linux-arm-kernel@lists.infradead.org>,
	open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] thermal/drivers/exynos: Fix NULL pointer dereference when getting the critical temp
Date: Mon, 3 Oct 2022 15:50:03 +0200	[thread overview]
Message-ID: <3ff0dc4e-0708-9384-5ac2-01f23f35fa64@samsung.com> (raw)
In-Reply-To: <20221003132943.1383065-1-daniel.lezcano@linaro.org>

On 03.10.2022 15:29, Daniel Lezcano wrote:
> The driver is assuming the get_critical temperature exists as it is
> inherited by the thermal of ops. But this one has been removed in
> favor of the generic one.
>
> Use the generic thermal_zone_get_crit_temp() function instead
>
> Fixes: 13bea86623b ("thermal/of: Remove of_thermal_get_crit_temp(")
> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>   drivers/thermal/samsung/exynos_tmu.c | 5 ++---
>   1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index 5a1ffe2f3134..37465af59262 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -264,9 +264,8 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
>   	unsigned int status;
>   	int ret = 0, temp;
>   
> -	if (data->soc != SOC_ARCH_EXYNOS5433) /* FIXME */
> -		ret = tzd->ops->get_crit_temp(tzd, &temp);
> -	if (ret) {
> +	ret = thermal_zone_get_crit_temp(tzd, &temp);
> +	if (ret && data->soc != SOC_ARCH_EXYNOS5433) { /* FIXME */
>   		dev_err(&pdev->dev,
>   			"No CRITICAL trip point defined in device tree!\n");
>   		goto out;

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland


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