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cfg80211: add assert_cfg80211_lock() to ensure proper protection

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Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luis R. Rodriguez 2009-02-21 00:04:25 -05:00 committed by John W. Linville
parent bcf4f99b7b
commit 761cf7ecff
4 changed files with 27 additions and 2 deletions
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5
net/wireless/core.c
View File

@ -7,7 +7,6 @@
#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/nl80211.h>
#include <linux/debugfs.h>
@ -50,6 +49,8 @@ cfg80211_drv_by_wiphy_idx(int wiphy_idx)
if (!wiphy_idx_valid(wiphy_idx))
return NULL;
assert_cfg80211_lock();
list_for_each_entry(drv, &cfg80211_drv_list, list) {
if (drv->wiphy_idx == wiphy_idx) {
result = drv;
@ -69,6 +70,8 @@ __cfg80211_drv_from_info(struct genl_info *info)
struct net_device *dev;
int err = -EINVAL;
assert_cfg80211_lock();
if (info->attrs[NL80211_ATTR_WIPHY]) {
bywiphyidx = cfg80211_drv_by_wiphy_idx(
nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));

6
net/wireless/core.h
View File

@ -10,6 +10,7 @@
#include <linux/netdevice.h>
#include <linux/kref.h>
#include <linux/rbtree.h>
#include <linux/mutex.h>
#include <net/genetlink.h>
#include <net/wireless.h>
#include <net/cfg80211.h>
@ -73,6 +74,11 @@ bool wiphy_idx_valid(int wiphy_idx)
extern struct mutex cfg80211_mutex;
extern struct list_head cfg80211_drv_list;
static inline void assert_cfg80211_lock(void)
{
BUG_ON(!mutex_is_locked(&cfg80211_mutex));
}
struct cfg80211_internal_bss {
struct list_head list;
struct rb_node rbn;

3
net/wireless/nl80211.c
View File

@ -7,7 +7,6 @@
#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/if_ether.h>
#include <linux/ieee80211.h>
@ -138,6 +137,8 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
int i;
u16 ifmodes = dev->wiphy.interface_modes;
assert_cfg80211_lock();
hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_WIPHY);
if (!hdr)
return -1;

15
net/wireless/reg.c
View File

@ -276,6 +276,8 @@ static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
static bool regdom_changed(const char *alpha2)
{
assert_cfg80211_lock();
if (!cfg80211_regdomain)
return true;
if (alpha2_equal(cfg80211_regdomain->alpha2, alpha2))
@ -830,6 +832,8 @@ static void handle_channel(struct wiphy *wiphy, enum ieee80211_band band,
struct ieee80211_supported_band *sband;
struct ieee80211_channel *chan;
assert_cfg80211_lock();
sband = wiphy->bands[band];
BUG_ON(chan_idx >= sband->n_channels);
chan = &sband->channels[chan_idx];
@ -1042,6 +1046,9 @@ static int reg_copy_regd(const struct ieee80211_regdomain **dst_regd,
static int ignore_request(struct wiphy *wiphy, enum reg_set_by set_by,
const char *alpha2)
{
assert_cfg80211_lock();
/* All initial requests are respected */
if (!last_request)
return 0;
@ -1122,6 +1129,8 @@ int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
bool intersect = false;
int r = 0;
assert_cfg80211_lock();
r = ignore_request(wiphy, set_by, alpha2);
if (r == REG_INTERSECT) {
@ -1217,6 +1226,8 @@ EXPORT_SYMBOL(regulatory_hint);
static bool reg_same_country_ie_hint(struct wiphy *wiphy,
u32 country_ie_checksum)
{
assert_cfg80211_lock();
if (!last_request->wiphy)
return false;
if (likely(last_request->wiphy != wiphy))
@ -1583,6 +1594,8 @@ int set_regdom(const struct ieee80211_regdomain *rd)
{
int r;
assert_cfg80211_lock();
/* Note that this doesn't update the wiphys, this is done below */
r = __set_regdom(rd);
if (r) {
@ -1605,6 +1618,8 @@ int set_regdom(const struct ieee80211_regdomain *rd)
/* Caller must hold cfg80211_mutex */
void reg_device_remove(struct wiphy *wiphy)
{
assert_cfg80211_lock();
kfree(wiphy->regd);
if (!last_request || !last_request->wiphy)
return;