linux-kernel - [PATCH AUTOSEL 6.12 04/13] wifi: mac80211: flush the station before moving it to UN-AUTHORIZED state

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Message-Id: <20250317163818.1893102-4-sashal@kernel.org>
Date: Mon, 17 Mar 2025 12:38:09 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Miri Korenblit <miriam.rachel.korenblit@...el.com>,
	Sasha Levin <sashal@...nel.org>,
	johannes@...solutions.net,
	linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 6.12 04/13] wifi: mac80211: flush the station before moving it to UN-AUTHORIZED state

From: Emmanuel Grumbach <emmanuel.grumbach@...el.com>

[ Upstream commit 43e04077170799d0e6289f3e928f727e401b3d79 ]

We first want to flush the station to make sure we no longer have any
frames being Tx by the station before the station is moved to
un-authorized state. Failing to do that will lead to races: a frame may
be sent after the station's state has been changed.

Since the API clearly states that the driver can't fail the sta_state()
transition down the list of state, we can easily flush the station
first, and only then call the driver's sta_state().

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
Reviewed-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@...el.com>
Link: https://patch.msgid.link/20250306123626.450bc40e8b04.I636ba96843c77f13309c15c9fd6eb0c5a52a7976@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/mac80211/sta_info.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index aa22f09e6d145..49095f19a0f22 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -4,7 +4,7 @@
  * Copyright 2006-2007	Jiri Benc <jbenc@...e.cz>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
  * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
- * Copyright (C) 2018-2023 Intel Corporation
+ * Copyright (C) 2018-2024 Intel Corporation
  */
 
 #include <linux/module.h>
@@ -1317,9 +1317,13 @@ static int _sta_info_move_state(struct sta_info *sta,
 		sta->sta.addr, new_state);
 
 	/* notify the driver before the actual changes so it can
-	 * fail the transition
+	 * fail the transition if the state is increasing.
+	 * The driver is required not to fail when the transition
+	 * is decreasing the state, so first, do all the preparation
+	 * work and only then, notify the driver.
 	 */
-	if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
+	if (new_state > sta->sta_state &&
+	    test_sta_flag(sta, WLAN_STA_INSERTED)) {
 		int err = drv_sta_state(sta->local, sta->sdata, sta,
 					sta->sta_state, new_state);
 		if (err)
@@ -1395,6 +1399,16 @@ static int _sta_info_move_state(struct sta_info *sta,
 		break;
 	}
 
+	if (new_state < sta->sta_state &&
+	    test_sta_flag(sta, WLAN_STA_INSERTED)) {
+		int err = drv_sta_state(sta->local, sta->sdata, sta,
+					sta->sta_state, new_state);
+
+		WARN_ONCE(err,
+			  "Driver is not allowed to fail if the sta_state is transitioning down the list: %d\n",
+			  err);
+	}
+
 	sta->sta_state = new_state;
 
 	return 0;
-- 
2.39.5