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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 <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20230207115520.846232-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Usyskin 2023-02-07 13:55:19 +02:00 committed by Greg Kroah-Hartman
parent 209cdbd07c
commit 784304ae5e
1 changed files with 2 additions and 1 deletions
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3
drivers/misc/mei/bus.c
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@ -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);
}