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Commit 761cf7ec authored by Luis R. Rodriguez's avatar Luis R. Rodriguez Committed by John W. Linville
Browse files

cfg80211: add assert_cfg80211_lock() to ensure proper protection 



Signed-off-by: default avatarLuis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent bcf4f99b

net/wireless/core.c

+4 −1
Original line number Diff line number Diff line
@@ -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]));

net/wireless/core.h

+6 −0
Original line number Diff line number Diff line
@@ -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;

net/wireless/nl80211.c

+2 −1
Original line number Diff line number Diff line
@@ -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;

net/wireless/reg.c

+15 −0
Original line number Diff line number Diff line
@@ -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;