From b18c6b7bcb369bd7dc222cc40c7264a6b5c4fa44 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C3=8D=C3=B1igo=20Huguet?= Date: Fri, 21 Jan 2022 08:49:02 +0100 Subject: [PATCH 09/36] rtw89: Fix variable dereferenced before check 'sta' MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Bugzilla: http://bugzilla.redhat.com/2033291 commit 5d44f0672319c19a41ff0e0e4f0d64164cf9752b Author: Ping-Ke Shih Date: Fri Oct 22 14:12:42 2021 +0800 rtw89: Fix variable dereferenced before check 'sta' The pointer rtwsta is dereferencing pointer sta before sta is being null checked. Fix this by assigning sta->drv_priv to rtwsta only if sta is not NULL, otherwise just NULL. Fixes: e3ec7017f6a2 ("rtw89: add Realtek 802.11ax driver") Reported-by: Colin Ian King Signed-off-by: Ping-Ke Shih Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20211022061242.8383-1-pkshih@realtek.com Signed-off-by: Íñigo Huguet --- drivers/net/wireless/realtek/rtw89/core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw89/core.c b/drivers/net/wireless/realtek/rtw89/core.c index 06fb6e5b1b37..d02ec5a735cb 100644 --- a/drivers/net/wireless/realtek/rtw89/core.c +++ b/drivers/net/wireless/realtek/rtw89/core.c @@ -1412,7 +1412,7 @@ static void rtw89_core_ba_work(struct work_struct *work) list_for_each_entry_safe(rtwtxq, tmp, &rtwdev->ba_list, list) { struct ieee80211_txq *txq = rtw89_txq_to_txq(rtwtxq); struct ieee80211_sta *sta = txq->sta; - struct rtw89_sta *rtwsta = (struct rtw89_sta *)sta->drv_priv; + struct rtw89_sta *rtwsta = sta ? (struct rtw89_sta *)sta->drv_priv : NULL; u8 tid = txq->tid; if (!sta) { @@ -1462,7 +1462,7 @@ static void rtw89_core_txq_check_agg(struct rtw89_dev *rtwdev, struct ieee80211_hw *hw = rtwdev->hw; struct ieee80211_txq *txq = rtw89_txq_to_txq(rtwtxq); struct ieee80211_sta *sta = txq->sta; - struct rtw89_sta *rtwsta = (struct rtw89_sta *)sta->drv_priv; + struct rtw89_sta *rtwsta = sta ? (struct rtw89_sta *)sta->drv_priv : NULL; if (unlikely(skb_get_queue_mapping(skb) == IEEE80211_AC_VO)) return; @@ -1534,7 +1534,7 @@ static bool rtw89_core_txq_agg_wait(struct rtw89_dev *rtwdev, { struct rtw89_txq *rtwtxq = (struct rtw89_txq *)txq->drv_priv; struct ieee80211_sta *sta = txq->sta; - struct rtw89_sta *rtwsta = (struct rtw89_sta *)sta->drv_priv; + struct rtw89_sta *rtwsta = sta ? (struct rtw89_sta *)sta->drv_priv : NULL; if (!sta || rtwsta->max_agg_wait <= 0) return false; -- 2.13.6