netdev - [PATCH AUTOSEL 6.6 046/139] wifi: mac80211: fix RCU list iterations

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Message-ID: <20240925121137.1307574-46-sashal@kernel.org>
Date: Wed, 25 Sep 2024 08:07:46 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Johannes Berg <johannes.berg@...el.com>,
	Miriam Rachel Korenblit <miriam.rachel.korenblit@...el.com>,
	Sasha Levin <sashal@...nel.org>,
	johannes@...solutions.net,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 046/139] wifi: mac80211: fix RCU list iterations

From: Johannes Berg <johannes.berg@...el.com>

[ Upstream commit ac35180032fbc5d80b29af00ba4881815ceefcb6 ]

There are a number of places where RCU list iteration is
used, but that aren't (always) called with RCU held. Use
just list_for_each_entry() in most, and annotate iface
iteration with the required locks.

Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@...el.com>
Link: https://patch.msgid.link/20240827094939.ed8ac0b2f897.I8443c9c3c0f8051841353491dae758021b53115e@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/mac80211/chan.c | 4 +++-
 net/mac80211/mlme.c | 2 +-
 net/mac80211/scan.c | 2 +-
 net/mac80211/util.c | 4 +++-
 4 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 68952752b5990..c09aed6a3cfcc 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -245,7 +245,9 @@ ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata,
 	enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
 	struct sta_info *sta;
 
-	list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
+	lockdep_assert_wiphy(sdata->local->hw.wiphy);
+
+	list_for_each_entry(sta, &sdata->local->sta_list, list) {
 		if (sdata != sta->sdata &&
 		    !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
 			continue;
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 42e2c84ed2484..b14c809bcdea3 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -732,7 +732,7 @@ static bool ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
 		bool disable_mu_mimo = false;
 		struct ieee80211_sub_if_data *other;
 
-		list_for_each_entry_rcu(other, &local->interfaces, list) {
+		list_for_each_entry(other, &local->interfaces, list) {
 			if (other->vif.bss_conf.mu_mimo_owner) {
 				disable_mu_mimo = true;
 				break;
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 3d68db738cde4..ea554e21e7a19 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -489,7 +489,7 @@ static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
 	 * the scan was in progress; if there was none this will
 	 * just be a no-op for the particular interface.
 	 */
-	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+	list_for_each_entry(sdata, &local->interfaces, list) {
 		if (ieee80211_sdata_running(sdata))
 			wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
 	}
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index d682c32821a11..02b5aaad2a155 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -745,7 +745,9 @@ static void __iterate_interfaces(struct ieee80211_local *local,
 	struct ieee80211_sub_if_data *sdata;
 	bool active_only = iter_flags & IEEE80211_IFACE_ITER_ACTIVE;
 
-	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+	list_for_each_entry_rcu(sdata, &local->interfaces, list,
+				lockdep_is_held(&local->iflist_mtx) ||
+				lockdep_is_held(&local->hw.wiphy->mtx)) {
 		switch (sdata->vif.type) {
 		case NL80211_IFTYPE_MONITOR:
 			if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
-- 
2.43.0