From: Lars-Peter Clausen <lars@metafoo.de>
Date: Thu, 11 Nov 2010 18:00:53 +0000 (+0100)
Subject: jz4740-battery: Check if platform_data is supplied
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8477cedb49c69ce64b603d76c7776811eec0f9d7;p=linux-beck.git

jz4740-battery: Check if platform_data is supplied

Currently platform_data is dereferenced without checking whether it
is actually set, which can lead to kernel crashes.
This patch adds a check which will abort the drivers probe function
gracefully if no platform_data is supplied.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
---

diff --git a/drivers/power/jz4740-battery.c b/drivers/power/jz4740-battery.c
index 2bbe04ae13a7..5b4821593201 100644
--- a/drivers/power/jz4740-battery.c
+++ b/drivers/power/jz4740-battery.c
@@ -246,6 +246,11 @@ static int __devinit jz_battery_probe(struct platform_device *pdev)
 	struct jz_battery *jz_battery;
 	struct power_supply *battery;
 
+	if (!pdata) {
+		dev_err(&pdev->dev, "No platform_data supplied\n");
+		return -ENXIO;
+	}
+
 	jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
 	if (!jz_battery) {
 		dev_err(&pdev->dev, "Failed to allocate driver structure\n");