media: uvcvideo: Fix deadlock during uvc_probe

JIRA: https://issues.redhat.com/browse/RHEL-78828
CVE: CVE-2024-58059

commit a67f75c
Author: Ricardo Ribalda <ribalda@chromium.org>
Date: Tue, 22 Oct 2024 08:30:30 +0000

  CVE: CVE-2024-58059

  If uvc_probe() fails, it can end up calling uvc_status_unregister() before
  uvc_status_init() is called.

  Fix this by checking if dev->status is NULL or not in
  uvc_status_unregister().

  Reported-by: syzbot+9446d5e0d25571e6a212@syzkaller.appspotmail.com
  Closes: https://lore.kernel.org/linux-media/20241020160249.GD7770@pendragon.ideasonboard.com/T/#m506744621d72a2ace5dd2ab64055be9898112dbd
  Fixes: c5fe3ed ("media: uvcvideo: Avoid race condition during unregister")
  Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
  Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  Link: https://lore.kernel.org/r/20241022-race-unreg-v1-1-2212f364d9de@chromium.org
  Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Signed-off-by: Desnes Nunes <desnesn@redhat.com>

Author: Desnes Nunes

drivers/media/usb/uvc/uvc_status.c

@@ -294,6 +294,9 @@ int uvc_status_init(struct uvc_device *dev)
 
 void uvc_status_unregister(struct uvc_device *dev)
 {
+	if (!dev->status)
+		return;
+
 	uvc_status_suspend(dev);
 	uvc_input_unregister(dev);
 }