[media] dvb_usb_v2: ensure driver_info is not null

It could be null in case of driver does not set it
properly, like missing dynamic ID handling.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/dvb/dvb-usb/dvb_usb_init.c b/drivers/media/dvb/dvb-usb/dvb_usb_init.c
index a2beb60..3078371 100644 (file)
--- a/drivers/media/dvb/dvb-usb/dvb_usb_init.c
+++ b/drivers/media/dvb/dvb-usb/dvb_usb_init.c
@@ -258,10 +258,18 @@ int dvb_usbv2_device_init_(struct usb_interface *intf,
        struct dvb_usb_device *d = NULL;
        struct dvb_usb_driver_info *driver_info =
                        (struct dvb_usb_driver_info *) id->driver_info;
-       const struct dvb_usb_device_properties *props = driver_info->props;
+       const struct dvb_usb_device_properties *props;
        int ret = -ENOMEM;
        bool cold = false;
 
+       if (!id->driver_info) {
+               pr_err("%s: driver_info is null", KBUILD_MODNAME);
+               ret = -ENODEV;
+               goto err;
+       }
+
+       props = driver_info->props;
+
        d = kzalloc(sizeof(struct dvb_usb_device), GFP_KERNEL);
        if (d == NULL) {
                err("no memory for 'struct dvb_usb_device'");
@@ -326,7 +334,8 @@ int dvb_usbv2_device_init_(struct usb_interface *intf,
 err_kfree:
        kfree(d->priv);
        kfree(d);
-
+err:
+       pr_debug("%s: failed=%d\n", __func__, ret);
        return ret;
 }