Commit a90c7a31 authored by Luis R. Rodriguez's avatar Luis R. Rodriguez Committed by John W. Linville
Browse files

cfg80211: add a timer for invalid user reg hints 

We have no other option but to inform userspace that we
have queued up their regulatory hint request when we are
given one given that nl80211 operates atomically on user
requests. The best we can do is accept the request, and
add a delayed work item for processing failure and cancel it
if we succeeed. Upon failure we restore the regulatory
settings and ignore the user input.

This fixes this reported bug:

https://bugzilla.kernel.org/show_bug.cgi?id=28112



Reported-by: default avatar <gregoryx.alagnou@intel.com>
Signed-off-by: default avatarLuis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 14609555

net/wireless/reg.c

+24 −1
Original line number Diff line number Diff line
@@ -106,6 +106,9 @@ struct reg_beacon { 
static void reg_todo(struct work_struct *work);

static DECLARE_WORK(reg_work, reg_todo);



static void reg_timeout_work(struct work_struct *work);

static DECLARE_DELAYED_WORK(reg_timeout, reg_timeout_work);



/* We keep a static world regulatory domain in case of the absence of CRDA */

static const struct ieee80211_regdomain world_regdom = {

	.n_reg_rules = 5,
@@ -1330,6 +1333,9 @@ static void reg_set_request_processed(void) 
		need_more_processing = true;

	spin_unlock(&reg_requests_lock);



	if (last_request->initiator == NL80211_REGDOM_SET_BY_USER)

		cancel_delayed_work_sync(&reg_timeout);



	if (need_more_processing)

		schedule_work(&reg_work);

}
@@ -1440,8 +1446,17 @@ static void reg_process_hint(struct regulatory_request *reg_request) 
	r = __regulatory_hint(wiphy, reg_request);

	/* This is required so that the orig_* parameters are saved */

	if (r == -EALREADY && wiphy &&

	    wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)

	    wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY) {

		wiphy_update_regulatory(wiphy, initiator);

		return;

	}



	/*

	 * We only time out user hints, given that they should be the only

	 * source of bogus requests.

	 */

	if (reg_request->initiator == NL80211_REGDOM_SET_BY_USER)

		schedule_delayed_work(&reg_timeout, msecs_to_jiffies(3142));

}



/*
@@ -2169,6 +2184,13 @@ out: 
	mutex_unlock(&reg_mutex);

}



static void reg_timeout_work(struct work_struct *work)

{

	REG_DBG_PRINT("Timeout while waiting for CRDA to reply, "

		      "restoring regulatory settings");

	restore_regulatory_settings(true);

}



int __init regulatory_init(void)

{

	int err = 0;
@@ -2222,6 +2244,7 @@ void /* __init_or_exit */ regulatory_exit(void) 
	struct reg_beacon *reg_beacon, *btmp;



	cancel_work_sync(&reg_work);

	cancel_delayed_work_sync(&reg_timeout);



	mutex_lock(&cfg80211_mutex);

	mutex_lock(&reg_mutex);

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