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mt76: mt7915: take RCU read lock when calling ieee80211_bss_get_elem()

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As ieee80211_bss_get_elem() derefences an RCU to return ie, both
the call to this function and any operation on this variable need
protection by the RCU read lock.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Ryder Lee 2021-07-14 17:18:48 +08:00 committed by Felix Fietkau
parent d45dac0732
commit ffbebe7649
1 changed files with 3 additions and 0 deletions
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3
drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
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@ -923,12 +923,15 @@ static void mt7915_check_he_obss_narrow_bw_ru_iter(struct wiphy *wiphy,
struct mt7915_he_obss_narrow_bw_ru_data *data = _data;
const struct element *elem;
rcu_read_lock();
elem = ieee80211_bss_get_elem(bss, WLAN_EID_EXT_CAPABILITY);
if (!elem || elem->datalen <= 10 ||
!(elem->data[10] &
WLAN_EXT_CAPA10_OBSS_NARROW_BW_RU_TOLERANCE_SUPPORT))
data->tolerated = false;
rcu_read_unlock();
}
static bool mt7915_check_he_obss_narrow_bw_ru(struct ieee80211_hw *hw,