From: Thor Thayer <tthayer@opensource.altera.com>
Date: Tue, 25 Oct 2016 16:31:23 +0000 (-0500)
Subject: gpio: gpiolib-devprop: Check chip->parent pointer before dereferencing
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5a195c6d4ecf43be26ee1c8be6140025832adfd2;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

gpio: gpiolib-devprop: Check chip->parent pointer before dereferencing

Confirm the chip->parent is valid before dereferencing because
the parent parameter is optional.

Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---

diff --git a/drivers/gpio/gpiolib-devprop.c b/drivers/gpio/gpiolib-devprop.c
index 17bfc41692ef..27f383bda7d9 100644
--- a/drivers/gpio/gpiolib-devprop.c
+++ b/drivers/gpio/gpiolib-devprop.c
@@ -31,6 +31,11 @@ void devprop_gpiochip_set_names(struct gpio_chip *chip)
 	const char **names;
 	int ret, i;
 
+	if (!chip->parent) {
+		dev_warn(&gdev->dev, "GPIO chip parent is NULL\n");
+		return;
+	}
+
 	ret = device_property_read_string_array(chip->parent, "gpio-line-names",
 						NULL, 0);
 	if (ret < 0)