power: supply: isp1704: Fix unchecked return value of devm_kzalloc

commit 8b208399 upstream.

Function devm_kzalloc() will return a NULL pointer. However, in function
isp1704_charger_probe(), the return value of devm_kzalloc() is directly
used without validation. This may result in a bad memory access bug.

Fixes: 34a10961 ("isp1704_charger: Add DT support")
Signed-off-by: Pan Bian <bianpan2016@163.com>
Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

drivers/power/isp1704_charger.c

@@ -415,6 +415,10 @@ static int isp1704_charger_probe(struct platform_device *pdev)
 
 		pdata = devm_kzalloc(&pdev->dev,
 			sizeof(struct isp1704_charger_data), GFP_KERNEL);
+		if (!pdata) {
+			ret = -ENOMEM;
+			goto fail0;
+		}
 		pdata->enable_gpio = gpio;
 
 		dev_info(&pdev->dev, "init gpio %d\n", pdata->enable_gpio);