linux-kernel - [PATCH] soc: samsung: exynos-pmu: fix reference count leak in exynos_get_pmu_regmap_by

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Message-Id: <20251028031527.43003-1-linmq006@gmail.com>
Date: Tue, 28 Oct 2025 11:15:27 +0800
From: Miaoqian Lin <linmq006@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Peter Griffin <peter.griffin@...aro.org>,
	Sam Protsenko <semen.protsenko@...aro.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: linmq006@...il.com,
	stable@...r.kernel.org
Subject: [PATCH] soc: samsung: exynos-pmu: fix reference count leak in exynos_get_pmu_regmap_by_phandle

The driver_find_device_by_of_node() function calls driver_find_device
and returns a device with its reference count incremented.
Add the missing put_device() call to
release this reference after the device is used.

Found via static analysis.

Fixes: 0b7c6075022c ("soc: samsung: exynos-pmu: Add regmap support for SoCs that protect PMU regs")
Cc: stable@...r.kernel.org
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/soc/samsung/exynos-pmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/soc/samsung/exynos-pmu.c b/drivers/soc/samsung/exynos-pmu.c
index 22c50ca2aa79..a53c1f882e1a 100644
--- a/drivers/soc/samsung/exynos-pmu.c
+++ b/drivers/soc/samsung/exynos-pmu.c
@@ -346,6 +346,7 @@ struct regmap *exynos_get_pmu_regmap_by_phandle(struct device_node *np,
 	if (!dev)
 		return ERR_PTR(-EPROBE_DEFER);
 
+	put_device(dev);
 	return syscon_node_to_regmap(pmu_np);
 }
 EXPORT_SYMBOL_GPL(exynos_get_pmu_regmap_by_phandle);
-- 
2.39.5 (Apple Git-154)