From: Johannes Berg <johannes.berg@xxxxxxxxx> [ 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@xxxxxxxxx> Link: https://patch.msgid.link/20240827094939.ed8ac0b2f897.I8443c9c3c0f8051841353491dae758021b53115e@changeid Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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 e8567723e94d5..b72e4036526bf 100644 --- a/net/mac80211/chan.c +++ b/net/mac80211/chan.c @@ -286,7 +286,9 @@ ieee80211_get_max_required_bw(struct ieee80211_link_data *link) 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 f9526bbc36337..3a0433e088906 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -1231,7 +1231,7 @@ 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 b5f2df61c7f67..2dd84fc542b2a 100644 --- a/net/mac80211/scan.c +++ b/net/mac80211/scan.c @@ -504,7 +504,7 @@ 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 c7ad9bc5973a0..aed72794d9fe3 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -751,7 +751,9 @@ 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
