[media] vp7045: fix buffer setup

dvb_usb_device_init calls the frontend_attach method of this driver which
uses vp7045_usb_ob. In order to have a buffer ready in vp7045_usb_op, it has to
be allocated before that happens.

Luckily we can use the whole private data as the buffer as it gets separately
allocated on the heap via kzalloc in dvb_usb_device_init and is thus apt for
use via usb_control_msg.

This fixes a
	BUG: unable to handle kernel paging request at 0000000000001e78

reported by Tino Keitel and diagnosed by Dan Carpenter.

Cc: stable@kernel.org # For v3.0 and upper
Tested-by: Tino Keitel <tino.keitel@tikei.de>
Signed-off-by: Florian Mickler <florian@mickler.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/dvb/dvb-usb/vp7045.c b/drivers/media/dvb/dvb-usb/vp7045.c
index 3db89e3..536c16c 100644 (file)
--- a/drivers/media/dvb/dvb-usb/vp7045.c
+++ b/drivers/media/dvb/dvb-usb/vp7045.c
@@ -224,26 +224,8 @@ static struct dvb_usb_device_properties vp7045_properties;
 static int vp7045_usb_probe(struct usb_interface *intf,
                const struct usb_device_id *id)
 {
-       struct dvb_usb_device *d;
-       int ret = dvb_usb_device_init(intf, &vp7045_properties,
-                                  THIS_MODULE, &d, adapter_nr);
-       if (ret)
-               return ret;
-
-       d->priv = kmalloc(20, GFP_KERNEL);
-       if (!d->priv) {
-               dvb_usb_device_exit(intf);
-               return -ENOMEM;
-       }
-
-       return ret;
-}
-
-static void vp7045_usb_disconnect(struct usb_interface *intf)
-{
-       struct dvb_usb_device *d = usb_get_intfdata(intf);
-       kfree(d->priv);
-       dvb_usb_device_exit(intf);
+       return dvb_usb_device_init(intf, &vp7045_properties,
+                                  THIS_MODULE, NULL, adapter_nr);
 }
 
 static struct usb_device_id vp7045_usb_table [] = {
@@ -258,7 +240,7 @@ MODULE_DEVICE_TABLE(usb, vp7045_usb_table);
 static struct dvb_usb_device_properties vp7045_properties = {
        .usb_ctrl = CYPRESS_FX2,
        .firmware = "dvb-usb-vp7045-01.fw",
-       .size_of_priv = sizeof(u8 *),
+       .size_of_priv = 20,
 
        .num_adapters = 1,
        .adapter = {
@@ -305,7 +287,7 @@ static struct dvb_usb_device_properties vp7045_properties = {
 static struct usb_driver vp7045_usb_driver = {
        .name           = "dvb_usb_vp7045",
        .probe          = vp7045_usb_probe,
-       .disconnect     = vp7045_usb_disconnect,
+       .disconnect     = dvb_usb_device_exit,
        .id_table       = vp7045_usb_table,
 };