From: Axel Lin <axel.lin@ingics.com>
Date: Sat, 20 Dec 2014 14:47:07 +0000 (+0800)
Subject: gpio: grgpio: Avoid potential NULL pointer dereference
X-Git-Tag: v3.19-rc5~31^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=879828c6ade916d13a5187eb02546899c2cd496c;p=platform%2Fkernel%2Flinux-exynos.git

gpio: grgpio: Avoid potential NULL pointer dereference

irqmap is optional property, so priv->domain can be NULL if !irqmap.
Thus add NULL test for priv->domain before calling irq_domain_remove()
to prevent NULL pointer dereference.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---

diff --git a/drivers/gpio/gpio-grgpio.c b/drivers/gpio/gpio-grgpio.c
index 09daaf2..3a5a710 100644
--- a/drivers/gpio/gpio-grgpio.c
+++ b/drivers/gpio/gpio-grgpio.c
@@ -441,7 +441,8 @@ static int grgpio_probe(struct platform_device *ofdev)
 	err = gpiochip_add(gc);
 	if (err) {
 		dev_err(&ofdev->dev, "Could not add gpiochip\n");
-		irq_domain_remove(priv->domain);
+		if (priv->domain)
+			irq_domain_remove(priv->domain);
 		return err;
 	}