From: Ricardo Ribalda Date: Tue, 22 Oct 2024 08:30:30 +0000 (+0000) Subject: media: uvcvideo: Fix deadlock during uvc_probe X-Git-Tag: v6.14-rc1~91^2~42 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a67f75c2b5ecf534eab416ce16c11fe780c4f8f6;p=thirdparty%2Fkernel%2Fstable.git media: uvcvideo: Fix deadlock during uvc_probe 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: c5fe3ed618f9 ("media: uvcvideo: Avoid race condition during unregister") Signed-off-by: Ricardo Ribalda Reviewed-by: Laurent Pinchart Link: https://lore.kernel.org/r/20241022-race-unreg-v1-1-2212f364d9de@chromium.org Signed-off-by: Laurent Pinchart Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/usb/uvc/uvc_status.c b/drivers/media/usb/uvc/uvc_status.c index d269d163b579a..ee01dce4b7834 100644 --- a/drivers/media/usb/uvc/uvc_status.c +++ b/drivers/media/usb/uvc/uvc_status.c @@ -295,6 +295,9 @@ 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); }