[PATCH] [media] au0828: fix double free in au0828_usb_probe()

[Alexey Khoroshilov]

In case of failure au0828_v4l2_device_register() deallocates dev
and returns error code to au0828_usb_probe(), which also
calls kfree(dev) on a failure path.

The patch removes duplicated code from au0828_v4l2_device_register().

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

Signed-off-by: Alexey Khoroshilov <khoroshi...@ispras.ru>
---
 drivers/media/usb/au0828/au0828-video.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/media/usb/au0828/au0828-video.c 
b/drivers/media/usb/au0828/au0828-video.c
index 32d7db96479c..7d0ec4cb248c 100644
--- a/drivers/media/usb/au0828/au0828-video.c
+++ b/drivers/media/usb/au0828/au0828-video.c
@@ -679,8 +679,6 @@ int au0828_v4l2_device_register(struct usb_interface 
*interface,
        if (retval) {
                pr_err("%s() v4l2_device_register failed\n",
                       __func__);
-               mutex_unlock(&dev->lock);
-               kfree(dev);
                return retval;
        }
 
@@ -691,8 +689,6 @@ int au0828_v4l2_device_register(struct usb_interface 
*interface,
        if (retval) {
                pr_err("%s() v4l2_ctrl_handler_init failed\n",
                       __func__);
-               mutex_unlock(&dev->lock);
-               kfree(dev);
                return retval;
        }
        dev->v4l2_dev.ctrl_handler = &dev->v4l2_ctrl_hdl;
-- 
1.9.1