From: Johannes Berg <johannes.berg@xxxxxxxxx> [ Upstream commit 6c608cd6962ebdf84fd3de6d42f88ed64d2f4e1b ] BSS elements are protected using RCU, so we need to use RCU properly to access them, fix that. Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx> Link: https://lore.kernel.org/r/iwlwifi.20210805130823.fd8b5791ab44.Iba26800a6301078d3782fb249c476dd8ac2bf3c6@changeid Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c index 141d9fc299b0..6981608ef165 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c @@ -2987,16 +2987,20 @@ static void iwl_mvm_check_he_obss_narrow_bw_ru_iter(struct wiphy *wiphy, void *_data) { struct iwl_mvm_he_obss_narrow_bw_ru_data *data = _data; + const struct cfg80211_bss_ies *ies; const struct element *elem; - elem = cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY, bss->ies->data, - bss->ies->len); + rcu_read_lock(); + ies = rcu_dereference(bss->ies); + elem = cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY, ies->data, + ies->len); if (!elem || elem->datalen < 10 || !(elem->data[10] & WLAN_EXT_CAPA10_OBSS_NARROW_BW_RU_TOLERANCE_SUPPORT)) { data->tolerated = false; } + rcu_read_unlock(); } static void iwl_mvm_check_he_obss_narrow_bw_ru(struct ieee80211_hw *hw, -- 2.30.2
