linux-kernel - [PATCH v4 2/9] ARM: EXYNOS: Fix potential NULL pointer access in exynos_sys_powerdown

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Date:	Tue, 10 Nov 2015 17:12:57 +0530
From:	Pankaj Dubey <pankaj.dubey@...sung.com>
To:	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc:	kgene.kim@...sung.com, k.kozlowski@...sung.com,
	thomas.ab@...sung.com, amitdanielk@...il.com, olof@...om.net,
	khilman@...aro.org, arnd@...db.de,
	Pankaj Dubey <pankaj.dubey@...sung.com>
Subject: [PATCH v4 2/9] ARM: EXYNOS: Fix potential NULL pointer access in
 exynos_sys_powerdown_conf

If no platform devices binded to the driver but driver itself loaded and
exynos_sys_powerdown_conf is called from
arch/arm/mach-exynos/{suspend.c, pm.c} it will result in NULL pointer access,
to prevent this added check on pmu_context for NULL.

Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
---
 arch/arm/mach-exynos/pmu.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-exynos/pmu.c b/arch/arm/mach-exynos/pmu.c
index 64ea7d6..14ec1ff 100644
--- a/arch/arm/mach-exynos/pmu.c
+++ b/arch/arm/mach-exynos/pmu.c
@@ -749,8 +749,12 @@ static void exynos5_powerdown_conf(enum sys_powerdown mode)
 void exynos_sys_powerdown_conf(enum sys_powerdown mode)
 {
 	unsigned int i;
+	const struct exynos_pmu_data *pmu_data;
+
+	if(!pmu_context)
+		return;
 
-	const struct exynos_pmu_data *pmu_data = pmu_context->pmu_data;
+	pmu_data = pmu_context->pmu_data;
 
 	if (pmu_data->powerdown_conf)
 		pmu_data->powerdown_conf(mode);
-- 
2.4.5

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