From a4055e74a2ff7c70ccdb6c36254ad5181464f211 Mon Sep 17 00:00:00 2001
From: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Date: Thu, 26 Mar 2020 15:09:34 +0200
Subject: [PATCH] mac80211: Don't destroy auth data in case of anti-clogging
Git-commit: a4055e74a2ff7c70ccdb6c36254ad5181464f211
Patch-mainline: v5.8-rc1
References: jsc#SLE-13430

SAE AP may reject authentication with WLAN_STATUS_ANTI_CLOG_REQUIRED.
As the user space will immediately continue the authentication flow,
there is no need to destroy the authentication data in this case.
This saves unneeded station removal and releasing the channel.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20200326150855.7483996157a8.I8040a842874aaf6d209df3fc8a2acb97a0bf508b@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 net/mac80211/mlme.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index b77787995723..56d61bc9954d 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2948,10 +2948,15 @@ static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
 	}
 
 	if (status_code != WLAN_STATUS_SUCCESS) {
+		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
+
+		if (auth_alg == WLAN_AUTH_SAE &&
+		    status_code == WLAN_STATUS_ANTI_CLOG_REQUIRED)
+			return;
+
 		sdata_info(sdata, "%pM denied authentication (status %d)\n",
 			   mgmt->sa, status_code);
 		ieee80211_destroy_auth_data(sdata, false);
-		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
 		event.u.mlme.status = MLME_DENIED;
 		event.u.mlme.reason = status_code;
 		drv_event_callback(sdata->local, sdata, &event);
-- 
2.16.4