[PATCH 5.15 113/279] mac80211: fix monitor_sdata RCU/locking assertions

Greg Kroah-Hartman
2021-11-24T13:52:06Z

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

[ Upstream commit 6dd2360334f3cb3b45fc1b8194c670090474b87c ]

Since commit a05829a7222e ("cfg80211: avoid holding the RTNL when
calling the driver") we've not only been protecting the pointer
to monitor_sdata with the RTNL, but also with the wiphy->mtx. This
is relevant in a number of lockdep assertions, e.g. the one we hit
in ieee80211_set_monitor_channel(). However, we're now protecting
all the assignments/dereferences, even the one in interface iter,
with the wiphy->mtx, so switch over the lockdep assertions to that
lock.

Fixes: a05829a7222e ("cfg80211: avoid holding the RTNL when calling the driver")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20211112135143.cb8e8ceffef3.Iaa210f16f6904c8a7a24954fb3396da0ef86ec08@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/mac80211/cfg.c | 12 ++++++++----
net/mac80211/iface.c | 4 +++-
net/mac80211/util.c | 7 ++++---
3 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index d69b31c20fe28..d3f62fd12f0b5 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -80,7 +80,8 @@ static int ieee80211_set_mon_options(struct ieee80211_sub_if_data *sdata,
}

/* also validate MU-MIMO change */
- monitor_sdata = rtnl_dereference(local->monitor_sdata);
+ monitor_sdata = wiphy_dereference(local->hw.wiphy,
+ local->monitor_sdata);

if (!monitor_sdata &&
(params->vht_mumimo_groups || params->vht_mumimo_follow_addr))
@@ -810,7 +811,8 @@ static int ieee80211_set_monitor_channel(struct wiphy *wiphy,

mutex_lock(&local->mtx);
if (local->use_chanctx) {
- sdata = rtnl_dereference(local->monitor_sdata);
+ sdata = wiphy_dereference(local->hw.wiphy,
+ local->monitor_sdata);
if (sdata) {
ieee80211_vif_release_channel(sdata);
ret = ieee80211_vif_use_channel(sdata, chandef,
@@ -2669,7 +2671,8 @@ static int ieee80211_set_tx_power(struct wiphy *wiphy,
sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);

if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
- sdata = rtnl_dereference(local->monitor_sdata);
+ sdata = wiphy_dereference(local->hw.wiphy,
+ local->monitor_sdata);
if (!sdata)
return -EOPNOTSUPP;
}
@@ -2729,7 +2732,8 @@ static int ieee80211_set_tx_power(struct wiphy *wiphy,
mutex_unlock(&local->iflist_mtx);

if (has_monitor) {
- sdata = rtnl_dereference(local->monitor_sdata);
+ sdata = wiphy_dereference(local->hw.wiphy,
+ local->monitor_sdata);
if (sdata) {
sdata->user_power_level = local->user_power_level;
if (txp_type != sdata->vif.bss_conf.txpower_type)
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 62c95597704b4..041859b5b71d0 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -588,7 +588,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_do
*/
if (local->suspended) {
WARN_ON(local->wowlan);
- WARN_ON(rtnl_dereference(local->monitor_sdata));
+ WARN_ON(rcu_access_pointer(local->monitor_sdata));
return;
}

@@ -932,6 +932,7 @@ int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
return 0;

ASSERT_RTNL();
+ lockdep_assert_wiphy(local->hw.wiphy);

if (local->monitor_sdata)
return 0;
@@ -999,6 +1000,7 @@ void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
return;

ASSERT_RTNL();
+ lockdep_assert_wiphy(local->hw.wiphy);

mutex_lock(&local->iflist_mtx);

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 49cb96d251695..03ea4f929b997 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -796,7 +796,7 @@ static void __iterate_interfaces(struct ieee80211_local *local,

sdata = rcu_dereference_check(local->monitor_sdata,
lockdep_is_held(&local->iflist_mtx) ||
- lockdep_rtnl_is_held());
+ lockdep_is_held(&local->hw.wiphy->mtx));
if (sdata &&
(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL || !active_only ||
sdata->flags & IEEE80211_SDATA_IN_DRIVER))
@@ -2379,7 +2379,7 @@ int ieee80211_reconfig(struct ieee80211_local *local)
IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);

/* add interfaces */
- sdata = rtnl_dereference(local->monitor_sdata);
+ sdata = wiphy_dereference(local->hw.wiphy, local->monitor_sdata);
if (sdata) {
/* in HW restart it exists already */
WARN_ON(local->resuming);
@@ -2424,7 +2424,8 @@ int ieee80211_reconfig(struct ieee80211_local *local)
WARN_ON(drv_add_chanctx(local, ctx));
mutex_unlock(&local->chanctx_mtx);

- sdata = rtnl_dereference(local->monitor_sdata);
+ sdata = wiphy_dereference(local->hw.wiphy,
+ local->monitor_sdata);
if (sdata && ieee80211_sdata_running(sdata))
ieee80211_assign_chanctx(local, sdata);
}
--
2.33.0