linux-kernel - [PATCH 4.4 127/312] mac80211: TDLS: always downgrade invalid chandefs

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Message-Id: <20200508123133.437228718@linuxfoundation.org>
Date:   Fri,  8 May 2020 14:31:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arik Nemtsov <arikx.nemtsov@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 4.4 127/312] mac80211: TDLS: always downgrade invalid chandefs

From: Arik Nemtsov <arik@...ery.com>

commit db8d99774c2682559b7648857697b9b588c6795a upstream.

Even if the current chandef width is equal to the station's max-BW, it
doesn't mean it's a valid width for TDLS. Make sure to always check
regulatory constraints in these cases.

Fixes: 0fabfaafec3a ("mac80211: upgrade BW of TDLS peers when possible")
Signed-off-by: Arik Nemtsov <arikx.nemtsov@...el.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/mac80211/tdls.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/mac80211/tdls.c
+++ b/net/mac80211/tdls.c
@@ -332,7 +332,7 @@ ieee80211_tdls_chandef_vht_upgrade(struc
 		return;
 
 	/* proceed to downgrade the chandef until usable or the same */
-	while (uc.width > max_width &&
+	while (uc.width > max_width ||
 	       !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc,
 					      sdata->wdev.iftype))
 		ieee80211_chandef_downgrade(&uc);