HID: wacom: NULL dereferences on error in probe()

We can't pass a NULL to input_unregister_device().

Fixes: 2a6cdbdd4cc0 ('HID: wacom: Introduce new 'touch_input' device')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 4c0ffca97befd61cf3cdd947138d14070c4e7895..44958d79d598dfc3a7e6938a2babbf3e1fdc2188 100644 (file)
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -1271,11 +1271,13 @@ fail_leds:
        pad_input_dev = NULL;
        wacom_wac->pad_registered = false;
 fail_register_pad_input:
-       input_unregister_device(touch_input_dev);
+       if (touch_input_dev)
+               input_unregister_device(touch_input_dev);
        wacom_wac->touch_input = NULL;
        wacom_wac->touch_registered = false;
 fail_register_touch_input:
-       input_unregister_device(pen_input_dev);
+       if (pen_input_dev)
+               input_unregister_device(pen_input_dev);
        wacom_wac->pen_input = NULL;
        wacom_wac->pen_registered = false;
 fail_register_pen_input: