mac80211: don't validate unchanged AP bandwidth while tracking (963a1852) · Commits · 戴 / test

The MLME code in mac80211 must track whether or not the AP changed bandwidth, but if there's no change while tracking it shouldn't do anything, otherwise regulatory updates can make it impossible to connect to certain APs if the regulatory database doesn't match the information from the AP. See the precise scenario described in the code. This still leaves some possible problems with CSA or if the AP actually changed bandwidth, but those cases are less common and won't completely prevent using it. This fixes https://bugzilla.kernel.org/show_bug.cgi?id=70881 Cc: stable@vger.kernel.org Reported-and-tested-by:

Nate Carlson <kernel@natecarlson.com> Signed-off-by:

Johannes Berg <johannes.berg@intel.com>

net/mac80211/mlme.c

+22 −0

Original line number	Diff line number	Diff line
		@@ -271,6 +271,28 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
		ret = 0;

		out:
		/*
		* When tracking the current AP, don't do any further checks if the
		* new chandef is identical to the one we're currently using for the
		* connection. This keeps us from playing ping-pong with regulatory,
		* without it the following can happen (for example):
		* - connect to an AP with 80 MHz, world regdom allows 80 MHz
		* - AP advertises regdom US
		* - CRDA loads regdom US with 80 MHz prohibited (old database)
		* - the code below detects an unsupported channel, downgrades, and
		* we disconnect from the AP in the caller
		* - disconnect causes CRDA to reload world regdomain and the game
		* starts anew.
		* (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
		*
		* It seems possible that there are still scenarios with CSA or real
		* bandwidth changes where a this could happen, but those cases are
		* less common and wouldn't completely prevent using the AP.
		*/
		if (tracking &&
		cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
		return ret;

		/* don't print the message below for VHT mismatch if VHT is disabled */
		if (ret & IEEE80211_STA_DISABLE_VHT)
		vht_chandef = *chandef;

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