[PATCH AUTOSEL 6.6 046/139] wifi: mac80211: fix RCU list iterations
From: Sasha Levin <sashal@kernel.org>
Date: 2024-09-25 12:13:17
Also in:
linux-wireless, lkml, stable
Subsystem:
mac80211, the rest · Maintainers:
Johannes Berg, Linus Torvalds
From: Johannes Berg <redacted> [ 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@intel.com> Link: https://patch.msgid.link/20240827094939.ed8ac0b2f897.I8443c9c3c0f8051841353491dae758021b53115e@changeid Signed-off-by: Johannes Berg <redacted> Signed-off-by: Sasha Levin <sashal@kernel.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