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iwlwifi: mvm: fix access to BSS elements

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[ 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@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210805130823.fd8b5791ab44.Iba26800a6301078d3782fb249c476dd8ac2bf3c6@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Johannes Berg
2021-08-05 13:19:31 +03:00
committed by Greg Kroah-Hartman
parent 9e80a3d88f
commit 4ed6510e05
1 changed files with 6 additions and 2 deletions
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8
drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
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@@ -3029,16 +3029,20 @@ static void iwl_mvm_check_he_obss_narrow_bw_ru_iter(struct wiphy *wiphy,
void *_data) void *_data)
{ {
struct iwl_mvm_he_obss_narrow_bw_ru_data *data = _data; struct iwl_mvm_he_obss_narrow_bw_ru_data *data = _data;
const struct cfg80211_bss_ies *ies;
const struct element *elem; const struct element *elem;
elem = cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY, bss->ies->data, rcu_read_lock();
bss->ies->len); ies = rcu_dereference(bss->ies);
elem = cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY, ies->data,
ies->len);
if (!elem || elem->datalen < 10 || if (!elem || elem->datalen < 10 ||
!(elem->data[10] & !(elem->data[10] &
WLAN_EXT_CAPA10_OBSS_NARROW_BW_RU_TOLERANCE_SUPPORT)) { WLAN_EXT_CAPA10_OBSS_NARROW_BW_RU_TOLERANCE_SUPPORT)) {
data->tolerated = false; data->tolerated = false;
} }
rcu_read_unlock();
} }
static void iwl_mvm_check_he_obss_narrow_bw_ru(struct ieee80211_hw *hw, static void iwl_mvm_check_he_obss_narrow_bw_ru(struct ieee80211_hw *hw,