V4L/DVB: drivers/media/radio/si470x/radio-si470x-usb.c fix use after free

In si470x_usb_driver_disconnect() radio->disconnect_lock is accessed
after it is freed. This fixes the problem.

Coverity CID: 2530

Signed-off-by: Darren Jenkins <darrenrjenkins@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/media/radio/si470x/radio-si470x-usb.c b/drivers/media/radio/si470x/radio-si470x-usb.c
index a0a79c70dd5b..6f60841828da 100644
--- a/drivers/media/radio/si470x/radio-si470x-usb.c
+++ b/drivers/media/radio/si470x/radio-si470x-usb.c
@@ -842,9 +842,11 @@ static void si470x_usb_driver_disconnect(struct usb_interface *intf)
                 kfree(radio->int_in_buffer);
                 video_unregister_device(radio->videodev);
                 kfree(radio->buffer);
+                mutex_unlock(&radio->disconnect_lock);
                 kfree(radio);
+        } else {
+                mutex_unlock(&radio->disconnect_lock);
         }
-        mutex_unlock(&radio->disconnect_lock);
 }