[media] cx231xx: fix usbdev leak on failure paths in cx231xx_usb_probe()

Commit b7085c086475 ("cx231xx: convert from pr_foo to dev_foo")
moves usb_get_dev(interface_to_usbdev(interface)) to the beginning
of cx231xx_usb_probe() to use udev->dev in dev_err(),
but it does not make sure usbdev is put on all failure paths.

Later dev_err(udev->dev) was replaced by dev_err(d).
So the patch moves usb_get_dev() below (before the first use)
and fixes another failure path.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/media/usb/cx231xx/cx231xx-cards.c b/drivers/media/usb/cx231xx/cx231xx-cards.c
index ae05d591f228..33c2fa2e7596 100644
--- a/drivers/media/usb/cx231xx/cx231xx-cards.c
+++ b/drivers/media/usb/cx231xx/cx231xx-cards.c
@@ -1403,7 +1403,6 @@ static int cx231xx_usb_probe(struct usb_interface *interface,
         struct usb_interface_assoc_descriptor *assoc_desc;
 
         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
-        udev = usb_get_dev(interface_to_usbdev(interface));
 
         /*
          * Interface number 0 - IR interface (handled by mceusb driver)
@@ -1424,11 +1423,13 @@ static int cx231xx_usb_probe(struct usb_interface *interface,
                 }
         } while (test_and_set_bit(nr, &cx231xx_devused));
 
+        udev = usb_get_dev(interface_to_usbdev(interface));
+
         /* allocate memory for our device state and initialize it */
         dev = devm_kzalloc(&udev->dev, sizeof(*dev), GFP_KERNEL);
         if (dev == NULL) {
-                clear_bit(nr, &cx231xx_devused);
-                return -ENOMEM;
+                retval = -ENOMEM;
+                goto err_if;
         }
 
         snprintf(dev->name, 29, "cx231xx #%d", nr);