Input: twl4030_keypad - fix potential NULL dereference in twl4030_kp_probe()

We should first check whether platform data is NULL or not, before
dereferencing it to get the keymap.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/input/keyboard/twl4030_keypad.c b/drivers/input/keyboard/twl4030_keypad.c
index cc06c4b2f920..a26922cf0e84 100644
--- a/drivers/input/keyboard/twl4030_keypad.c
+++ b/drivers/input/keyboard/twl4030_keypad.c
@@ -332,7 +332,7 @@ static int __devinit twl4030_kp_program(struct twl4030_keypad *kp)
 static int __devinit twl4030_kp_probe(struct platform_device *pdev)
 {
         struct twl4030_keypad_data *pdata = pdev->dev.platform_data;
-        const struct matrix_keymap_data *keymap_data = pdata->keymap_data;
+        const struct matrix_keymap_data *keymap_data;
         struct twl4030_keypad *kp;
         struct input_dev *input;
         u8 reg;
@@ -344,6 +344,8 @@ static int __devinit twl4030_kp_probe(struct platform_device *pdev)
                 return -EINVAL;
         }
 
+        keymap_data = pdata->keymap_data;
+
         kp = kzalloc(sizeof(*kp), GFP_KERNEL);
         input = input_allocate_device();
         if (!kp || !input) {