regulator: Avoid potential NULL dereference in reg_fixed_voltage_probe()

of_get_fixed_voltage_config() may return NULL, return -ENOMEM in this case
so we don't dereference NULL pointer.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index 703c26b756d..ebec5e06dfa 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -160,12 +160,17 @@ static struct regulator_ops fixed_voltage_ops = {
 
 static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev)
 {
-        struct fixed_voltage_config *config = pdev->dev.platform_data;
+        struct fixed_voltage_config *config;
         struct fixed_voltage_data *drvdata;
         int ret;
 
         if (pdev->dev.of_node)
                 config = of_get_fixed_voltage_config(&pdev->dev);
+        else
+                config = pdev->dev.platform_data;
+
+        if (!config)
+                return -ENOMEM;
 
         drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL);
         if (drvdata == NULL) {