[PATCH 09/12] iwlwifi: mvm: fix access to BSS elements
From: Luca Coelho <hidden>
Date: 2021-08-05 10:19:51
Subsystem:
intel wireless wifi link (iwlwifi), the rest · Maintainers:
Miri Korenblit, Linus Torvalds
From: Johannes Berg <redacted> BSS elements are protected using RCU, so we need to use RCU properly to access them, fix that. Signed-off-by: Johannes Berg <redacted> Signed-off-by: Luca Coelho <redacted> --- 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 c60c0b49d7f7..3a4585222d6d 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c@@ -2990,16 +2990,20 @@ 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,
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2.32.0