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From:   Daniel Lezcano <daniel.lezcano@linaro.org>
To:     daniel.lezcano@linaro.org, rafael@kernel.org,
        m.szyprowski@samsung.com
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>,
        linux-pm@vger.kernel.org (open list:SAMSUNG THERMAL DRIVER),
        linux-samsung-soc@vger.kernel.org (open list:SAMSUNG THERMAL DRIVER),
        linux-arm-kernel@lists.infradead.org (moderated list:ARM/SAMSUNG S3C,
        S5P AND EXYNOS ARM ARCHITECTURES),
        linux-kernel@vger.kernel.org (open list)
Subject: [PATCH] thermal/drivers/exynos: Fix NULL pointer dereference when getting the critical temp
Date:   Mon,  3 Oct 2022 15:29:43 +0200
Message-Id: <20221003132943.1383065-1-daniel.lezcano@linaro.org>
In-Reply-To: <4e4d873b-4a40-334a-34e7-defb0fcc4e6b@samsung.com>
References: <4e4d873b-4a40-334a-34e7-defb0fcc4e6b@samsung.com>
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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>
---
 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;
-- 
2.34.1