linux-kernel - [PATCH] ARM: exynos: Fix refcount leak in exynos_map

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Message-Id: <20220523145513.12341-1-linmq006@gmail.com>
Date:   Mon, 23 May 2022 18:55:13 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Russell King <linux@...linux.org.uk>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Pankaj Dubey <pankaj.dubey@...sung.com>,
        Tomasz Figa <t.figa@...sung.com>,
        Kukjin Kim <kgene.kim@...sung.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] ARM: exynos: Fix refcount leak in exynos_map_pmu

of_find_matching_node() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
Add missing of_node_put() to avoid refcount leak.
of_node_put() checks null pointer.

Fixes: fce9e5bb2526 ("ARM: EXYNOS: Add support for mapping PMU base address via DT")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 arch/arm/mach-exynos/exynos.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
index 8b48326be9fd..51a247ca4da8 100644
--- a/arch/arm/mach-exynos/exynos.c
+++ b/arch/arm/mach-exynos/exynos.c
@@ -149,6 +149,7 @@ static void exynos_map_pmu(void)
 	np = of_find_matching_node(NULL, exynos_dt_pmu_match);
 	if (np)
 		pmu_base_addr = of_iomap(np, 0);
+	of_node_put(np);
 }
 
 static void __init exynos_init_irq(void)
-- 
2.25.1