media: mceusb: return without resubmitting URB in case of -EPROTO error.
authorRajat Asthana <rajatasthana4@gmail.com>
Wed, 18 Aug 2021 20:31:10 +0000 (22:31 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 18 Nov 2021 18:16:13 +0000 (19:16 +0100)
commit5b55e15b663659a286bc98f3a0d9307e2280cfe1
tree563aa32c7d45a5a0f5ae043025bd74736bad04d7
parent51ae7f96267256f67d3a93ceac0c03ef7feaa956
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>
drivers/media/rc/mceusb.c