linux-kernel - [PATCH v2 1/2] clk: samsung: exynos5: Fix possible NULL pointer exception on platform_device

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Date:   Thu, 21 Feb 2019 12:45:51 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org
Subject: [PATCH v2 1/2] clk: samsung: exynos5: Fix possible NULL pointer exception on platform_device_alloc() failure

During initialization of subdevices if platform_device_alloc() failed,
returned NULL pointer will be later dereferenced.  Add proper error
paths to exynos5_clk_register_subcmu().  The return value of this
function is still ignored because at this stage of init there is nothing
we can do.

Fixes: b06a532bf1fa ("clk: samsung: Add Exynos5 sub-CMU clock driver")
Cc: <stable@...r.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
---
 drivers/clk/samsung/clk-exynos5-subcmu.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/samsung/clk-exynos5-subcmu.c b/drivers/clk/samsung/clk-exynos5-subcmu.c
index 93306283d764..d07ef26bd052 100644
--- a/drivers/clk/samsung/clk-exynos5-subcmu.c
+++ b/drivers/clk/samsung/clk-exynos5-subcmu.c
@@ -136,15 +136,21 @@ static int __init exynos5_clk_register_subcmu(struct device *parent,
 {
 	struct of_phandle_args genpdspec = { .np = pd_node };
 	struct platform_device *pdev;
+	int ret;
 
 	pdev = platform_device_alloc(info->pd_name, -1);
+	if (!pdev)
+		return -ENOMEM;
+
 	pdev->dev.parent = parent;
 	pdev->driver_override = "exynos5-subcmu";
 	platform_set_drvdata(pdev, (void *)info);
 	of_genpd_add_device(&genpdspec, &pdev->dev);
-	platform_device_add(pdev);
+	ret = platform_device_add(pdev);
+	if (ret)
+		platform_device_put(pdev);
 
-	return 0;
+	return ret;
 }
 
 static int __init exynos5_clk_probe(struct platform_device *pdev)
-- 
2.7.4