linux-kernel - [PATCH] Memory - Fix possible NULL derefrence.

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Date:   Mon, 30 Jan 2017 10:30:05 +0530
From:   Shailendra Verma <shailendra.v@...sung.com>
To:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Nicolas Ferre <nicolas.ferre@...el.com>,
        LABBE Corentin <clabbe.montjoie@...il.com>,
        linux-kernel@...r.kernel.org, p.shailesh@...sung.com,
        ashish.kalra@...sung.com,
        Shailendra Verma <shailendra.v@...sung.com>,
        Shailendra Verma <shailendra.capricorn@...il.com>
Subject: [PATCH] Memory - Fix possible NULL derefrence.

of_device_get_match_data could return NULL, and so can cause
a NULL pointer dereference later.

Signed-off-by: Shailendra Verma <shailendra.v@...sung.com>
---
 drivers/memory/atmel-sdramc.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/memory/atmel-sdramc.c b/drivers/memory/atmel-sdramc.c
index 12080b0..cb63fbe 100644
--- a/drivers/memory/atmel-sdramc.c
+++ b/drivers/memory/atmel-sdramc.c
@@ -57,6 +57,10 @@ static int atmel_ramc_probe(struct platform_device *pdev)
 	struct clk *clk;
 
 	caps = of_device_get_match_data(&pdev->dev);
+	if (!caps) {
+		dev_err(&pdev->dev, "no device match found\n");
+		return -ENODEV;
+	}
 
 	if (caps->has_ddrck) {
 		clk = devm_clk_get(&pdev->dev, "ddrck");
-- 
1.7.9.5