From 784304ae5e5ff407d81975a406328d57d66de27b Mon Sep 17 00:00:00 2001 From: Alexander Usyskin Date: Tue, 7 Feb 2023 13:55:19 +0200 Subject: mei: bus: disallow driver match while dismantling device With immediate reply support to enum request and FW reset, a device on MEI bus can be temporarily removed. A driver for a device on MEI bus can try to bind to the device right between bus attempt to remove driver and device structures removal. This leaves device driver with pointers to freed memory of device structures. Avoid bus device driver bind while dismantling device by disallowing device match right before driver release. Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Link: https://lore.kernel.org/r/20230207115520.846232-1-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman --- drivers/misc/mei/bus.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/misc/mei/bus.c') diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index a81b890c7ee6..71d53d7ffdba 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Copyright (c) 2012-2019, Intel Corporation. All rights reserved. + * Copyright (c) 2012-2023, Intel Corporation. All rights reserved. * Intel Management Engine Interface (Intel MEI) Linux driver */ @@ -1392,6 +1392,7 @@ static int mei_cl_bus_dev_add(struct mei_cl_device *cldev) */ static void mei_cl_bus_dev_stop(struct mei_cl_device *cldev) { + cldev->do_match = 0; if (cldev->is_added) device_release_driver(&cldev->dev); } -- cgit v1.2.3