Commit 9dbf2cf7 authored Aug 18, 2021 by Rajat Asthana Committed by Greg Kroah-Hartman Nov 26, 2021

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@syzkaller.appspotmail.com>
Signed-off-by: Rajat Asthana <rajatasthana4@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent ee322875

drivers/media/rc/mceusb.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1323,6 +1323,7 @@ static void mceusb_dev_recv(struct urb *urb)
		case -ECONNRESET:
		case -ENOENT:
		case -EILSEQ:
		case -EPROTO:
		case -ESHUTDOWN:
		usb_unlink_urb(urb);
		return;