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>
---
 drivers/power/jz4740-battery.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/power/jz4740-battery.c b/drivers/power/jz4740-battery.c
index 2bbe04a..5b48215 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");
-- 
1.5.6.5

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