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>

diff --git a/drivers/input/keyboard/twl4030_keypad.c b/drivers/input/keyboard/twl4030_keypad.c
index cc06c4b..a26922c 100644 (file)
--- 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) {