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

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Date:   Fri, 27 Jan 2017 16:44:02 +0530
From:   Shailendra Verma <shailendra.v@...sung.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        linux-gpio@...r.kernel.org, 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] Gpio - Fix possible NULL derefrence.

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

Signed-off-by: Shailendra Verma <shailendra.v@...sung.com>
---
 drivers/gpio/gpio-ge.c  |    5 +++++
 drivers/gpio/gpio-mxs.c |    5 +++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpio/gpio-ge.c b/drivers/gpio/gpio-ge.c
index 8650b29..395a85d 100644
--- a/drivers/gpio/gpio-ge.c
+++ b/drivers/gpio/gpio-ge.c
@@ -59,6 +59,11 @@ static int __init gef_gpio_probe(struct platform_device *pdev)
 	void __iomem *regs;
 	int ret;
 
+	if (!of_id) {
+		dev_err(&pdev->dev, "Error: No device match found\n");
+		return -ENODEV;
+	}
+
 	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
 	if (!gc)
 		return -ENOMEM;
diff --git a/drivers/gpio/gpio-mxs.c b/drivers/gpio/gpio-mxs.c
index ee17248..e28097f 100644
--- a/drivers/gpio/gpio-mxs.c
+++ b/drivers/gpio/gpio-mxs.c
@@ -272,6 +272,11 @@ static int mxs_gpio_probe(struct platform_device *pdev)
 	int irq_base;
 	int err;
 
+	if (!of_id) {
+		dev_err(&pdev->dev, "Error: No device match found\n");
+		return -ENODEV;
+	}
+
 	port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
 	if (!port)
 		return -ENOMEM;
-- 
1.7.9.5