From ffbebe7649c32139e765e9c64838a7d0a28bbd24 Mon Sep 17 00:00:00 2001
From: Ryder Lee <ryder.lee@mediatek.com>
Date: Wed, 14 Jul 2021 17:18:48 +0800
Subject: [PATCH] mt76: mt7915: take RCU read lock when calling
ieee80211_bss_get_elem()
Git-commit: ffbebe7649c32139e765e9c64838a7d0a28bbd24
References: git-fixes
Patch-mainline: v5.16-rc1
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>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
drivers/net/wireless/mediatek/mt76/mt7915/mcu.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index bab652eae434..2ba3d92ebd70 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -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,
--
2.35.3