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A race condition may occur between the .disconnect function, which is called when the device is disconnected, and the dvb_device_open() function, which is called when the device node is open()ed. This results in several types of UAFs. The root cause of this is that you use the dvb_device_open() function, which does not implement a conditional statement that checks 'dvbnet->exit'. So, add 'remove_mutex` to protect 'dvbnet->exit' and use locked_dvb_net_open() function to check 'dvbnet->exit'. [mchehab: fix a checkpatch warning] Link: https://lore.kernel.org/linux-media/20221117045925.14297-3-imv4bel@gmail.com Signed-off-by: Hyunwoo Kim <imv4bel@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/*
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* dvb_net.h
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*
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* Copyright (C) 2001 Ralph Metzler for convergence integrated media GmbH
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef _DVB_NET_H_
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#define _DVB_NET_H_
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#include <linux/module.h>
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#include <media/dvbdev.h>
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struct net_device;
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#define DVB_NET_DEVICES_MAX 10
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#ifdef CONFIG_DVB_NET
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/**
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* struct dvb_net - describes a DVB network interface
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*
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* @dvbdev: pointer to &struct dvb_device.
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* @device: array of pointers to &struct net_device.
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* @state: array of integers to each net device. A value
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* different than zero means that the interface is
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* in usage.
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* @exit: flag to indicate when the device is being removed.
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* @demux: pointer to &struct dmx_demux.
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* @ioctl_mutex: protect access to this struct.
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* @remove_mutex: mutex that avoids a race condition between a callback
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* called when the hardware is disconnected and the
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* file_operations of dvb_net.
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*
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* Currently, the core supports up to %DVB_NET_DEVICES_MAX (10) network
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* devices.
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*/
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struct dvb_net {
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struct dvb_device *dvbdev;
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struct net_device *device[DVB_NET_DEVICES_MAX];
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int state[DVB_NET_DEVICES_MAX];
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unsigned int exit:1;
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struct dmx_demux *demux;
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struct mutex ioctl_mutex;
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struct mutex remove_mutex;
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};
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/**
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* dvb_net_init - nitializes a digital TV network device and registers it.
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*
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* @adap: pointer to &struct dvb_adapter.
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* @dvbnet: pointer to &struct dvb_net.
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* @dmxdemux: pointer to &struct dmx_demux.
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*/
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int dvb_net_init(struct dvb_adapter *adap, struct dvb_net *dvbnet,
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struct dmx_demux *dmxdemux);
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/**
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* dvb_net_release - releases a digital TV network device and unregisters it.
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*
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* @dvbnet: pointer to &struct dvb_net.
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*/
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void dvb_net_release(struct dvb_net *dvbnet);
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#else
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struct dvb_net {
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struct dvb_device *dvbdev;
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};
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static inline void dvb_net_release(struct dvb_net *dvbnet)
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{
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}
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static inline int dvb_net_init(struct dvb_adapter *adap,
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struct dvb_net *dvbnet, struct dmx_demux *dmx)
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{
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return 0;
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}
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#endif /* ifdef CONFIG_DVB_NET */
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#endif
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