media: pvrusb2: fix memory leak in pvr_probe

mainline inclusion
from mainline-v6.1-rc1
commit 945a9a8e
category: bugfix
bugzilla: 187857, https://gitee.com/src-openeuler/kernel/issues/I5X9DT
CVE: CVE-2022-3577

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=945a9a8e448b65bec055d37eba58f711b39f66f0

--------------------------------

The error handling code in pvr2_hdw_create forgets to unregister the
v4l2 device. When pvr2_hdw_create returns back to pvr2_context_create,
it calls pvr2_context_destroy to destroy context, but mp->hdw is NULL,
which leads to that pvr2_hdw_destroy directly returns.

Fix this by adding v4l2_device_unregister to decrease the refcount of
usb interface.

Reported-by: syzbot+77b432d57c4791183ed4@syzkaller.appspotmail.com
Signed-off-by: NDongliang Mu <mudongliangabcd@gmail.com>
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: NLi Huafei <lihuafei1@huawei.com>
Reviewed-by: NKuohai Xu <xukuohai@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/media/usb/pvrusb2/pvrusb2-hdw.c

@@ -2610,6 +2610,7 @@ struct pvr2_hdw *pvr2_hdw_create(struct usb_interface *intf,
 		del_timer_sync(&hdw->encoder_run_timer);
 		del_timer_sync(&hdw->encoder_wait_timer);
 		flush_work(&hdw->workpoll);
+		v4l2_device_unregister(&hdw->v4l2_dev);
 		usb_free_urb(hdw->ctl_read_urb);
 		usb_free_urb(hdw->ctl_write_urb);
 		kfree(hdw->ctl_read_buffer);