linux-kernel - [PATCH] mfd: wm831x: Fix possible NULL pointer dereference

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Message-Id: <1442221676-26647-1-git-send-email-javier@osg.samsung.com>
Date:	Mon, 14 Sep 2015 11:07:56 +0200
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Javier Martinez Canillas <javier@....samsung.com>,
	Lee Jones <lee.jones@...aro.org>,
	patches@...nsource.wolfsonmicro.com,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: [PATCH] mfd: wm831x: Fix possible NULL pointer dereference

The driver always checks for pdata being NULL expect in one place.
Add a check to prevent a possible NULL pointer deference error.

Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>

---

 drivers/mfd/wm831x-core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c
index 28366a90e1ad..3e0e99ec5836 100644
--- a/drivers/mfd/wm831x-core.c
+++ b/drivers/mfd/wm831x-core.c
@@ -1626,7 +1626,9 @@ int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
 	mutex_init(&wm831x->io_lock);
 	mutex_init(&wm831x->key_lock);
 	dev_set_drvdata(wm831x->dev, wm831x);
-	wm831x->soft_shutdown = pdata->soft_shutdown;
+
+	if (pdata)
+		wm831x->soft_shutdown = pdata->soft_shutdown;
 
 	ret = wm831x_reg_read(wm831x, WM831X_PARENT_ID);
 	if (ret < 0) {
-- 
2.4.3

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