mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 13:03:25 +01:00
4172385b0c
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>
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/*
|
|
* dvb_net.h
|
|
*
|
|
* Copyright (C) 2001 Ralph Metzler for convergence integrated media GmbH
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public License
|
|
* as published by the Free Software Foundation; either version 2.1
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#ifndef _DVB_NET_H_
|
|
#define _DVB_NET_H_
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <media/dvbdev.h>
|
|
|
|
struct net_device;
|
|
|
|
#define DVB_NET_DEVICES_MAX 10
|
|
|
|
#ifdef CONFIG_DVB_NET
|
|
|
|
/**
|
|
* struct dvb_net - describes a DVB network interface
|
|
*
|
|
* @dvbdev: pointer to &struct dvb_device.
|
|
* @device: array of pointers to &struct net_device.
|
|
* @state: array of integers to each net device. A value
|
|
* different than zero means that the interface is
|
|
* in usage.
|
|
* @exit: flag to indicate when the device is being removed.
|
|
* @demux: pointer to &struct dmx_demux.
|
|
* @ioctl_mutex: protect access to this struct.
|
|
* @remove_mutex: mutex that avoids a race condition between a callback
|
|
* called when the hardware is disconnected and the
|
|
* file_operations of dvb_net.
|
|
*
|
|
* Currently, the core supports up to %DVB_NET_DEVICES_MAX (10) network
|
|
* devices.
|
|
*/
|
|
|
|
struct dvb_net {
|
|
struct dvb_device *dvbdev;
|
|
struct net_device *device[DVB_NET_DEVICES_MAX];
|
|
int state[DVB_NET_DEVICES_MAX];
|
|
unsigned int exit:1;
|
|
struct dmx_demux *demux;
|
|
struct mutex ioctl_mutex;
|
|
struct mutex remove_mutex;
|
|
};
|
|
|
|
/**
|
|
* dvb_net_init - nitializes a digital TV network device and registers it.
|
|
*
|
|
* @adap: pointer to &struct dvb_adapter.
|
|
* @dvbnet: pointer to &struct dvb_net.
|
|
* @dmxdemux: pointer to &struct dmx_demux.
|
|
*/
|
|
int dvb_net_init(struct dvb_adapter *adap, struct dvb_net *dvbnet,
|
|
struct dmx_demux *dmxdemux);
|
|
|
|
/**
|
|
* dvb_net_release - releases a digital TV network device and unregisters it.
|
|
*
|
|
* @dvbnet: pointer to &struct dvb_net.
|
|
*/
|
|
void dvb_net_release(struct dvb_net *dvbnet);
|
|
|
|
#else
|
|
|
|
struct dvb_net {
|
|
struct dvb_device *dvbdev;
|
|
};
|
|
|
|
static inline void dvb_net_release(struct dvb_net *dvbnet)
|
|
{
|
|
}
|
|
|
|
static inline int dvb_net_init(struct dvb_adapter *adap,
|
|
struct dvb_net *dvbnet, struct dmx_demux *dmx)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* ifdef CONFIG_DVB_NET */
|
|
|
|
#endif
|