linux-kernel - [PATCH] ARM: EXYNOS: Handle of_find_device_by

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Message-id: <1422984529-17729-1-git-send-email-k.kozlowski@samsung.com>
Date:	Tue, 03 Feb 2015 18:28:49 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Kyungmin Park <kyungmin.park@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Subject: [PATCH] ARM: EXYNOS: Handle of_find_device_by_node and kstrdup failures

Prevent possible NULL pointer dereference of pointer returned by
of_find_device_by_node(). Handle this by skipping such power domain.

Additionally fail the init on kstrdup() failure. Such case is actually
not fatal because the name for power domain allocated by kstrdup() is
used only in printk. Still as a precaution handle this as an error
condition.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
---
 arch/arm/mach-exynos/pm_domains.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
index fd7640a6b503..4c6c29ba58ef 100644
--- a/arch/arm/mach-exynos/pm_domains.c
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -116,6 +116,12 @@ static __init int exynos4_pm_init_power_domain(void)
 		struct device *dev;
 
 		pdev = of_find_device_by_node(np);
+		if (!pdev) {
+			pr_err("%s: failed to find device for node %s\n",
+					__func__, np->name);
+			of_node_put(np);
+			continue;
+		}
 		dev = &pdev->dev;
 
 		pd = kzalloc(sizeof(*pd), GFP_KERNEL);
@@ -126,6 +132,12 @@ static __init int exynos4_pm_init_power_domain(void)
 		}
 
 		pd->pd.name = kstrdup(np->name, GFP_KERNEL);
+		if (!pd->pd.name) {
+			kfree(pd);
+			of_node_put(np);
+			return -ENOMEM;
+		}
+
 		pd->name = pd->pd.name;
 		pd->base = of_iomap(np, 0);
 		if (!pd->base) {
-- 
1.9.1

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