This is a note to let you know that I've just added the patch titled media: mceusb: return without resubmitting URB in case of -EPROTO error. to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: media-mceusb-return-without-resubmitting-urb-in-case.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit a8ee406b27190ef9b43deb39074cb1e97f4db244 Author: Rajat Asthana <rajatasthana4@xxxxxxxxx> Date: Wed Aug 18 22:31:10 2021 +0200 media: mceusb: return without resubmitting URB in case of -EPROTO error. [ Upstream commit 476db72e521983ecb847e4013b263072bb1110fc ] Syzkaller reported a warning called "rcu detected stall in dummy_timer". The error seems to be an error in mceusb_dev_recv(). In the case of -EPROTO error, the routine immediately resubmits the URB. Instead it should return without resubmitting URB. Reported-by: syzbot+4d3749e9612c2cfab956@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Rajat Asthana <rajatasthana4@xxxxxxxxx> Signed-off-by: Sean Young <sean@xxxxxxxx> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/media/rc/mceusb.c b/drivers/media/rc/mceusb.c index c68e52c17ae13..31e56f4f34791 100644 --- a/drivers/media/rc/mceusb.c +++ b/drivers/media/rc/mceusb.c @@ -1386,6 +1386,7 @@ static void mceusb_dev_recv(struct urb *urb) case -ECONNRESET: case -ENOENT: case -EILSEQ: + case -EPROTO: case -ESHUTDOWN: usb_unlink_urb(urb); return;