linux-kernel - [PATCH 5.16 0463/1017] mt76: mt7603: check sta_rates pointer in mt7603_sta_rate_tbl

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Message-Id: <20220405070408.043003607@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:22:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lorenzo Bianconi <lorenzo@...nel.org>,
        Felix Fietkau <nbd@....name>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 0463/1017] mt76: mt7603: check sta_rates pointer in mt7603_sta_rate_tbl_update

From: Lorenzo Bianconi <lorenzo@...nel.org>

[ Upstream commit fc8e2c707ce11c8ec2e992885b0d53a5e04031ac ]

Check sta_rates pointer value in mt7603_sta_rate_tbl_update routine
since minstrel_ht_update_rates can fail allocating rates array.

Fixes: c8846e1015022 ("mt76: add driver for MT7603E and MT7628/7688")
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7603/main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7603/main.c b/drivers/net/wireless/mediatek/mt76/mt7603/main.c
index 7ac4cd247a73..689fcee282b3 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7603/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7603/main.c
@@ -623,6 +623,9 @@ mt7603_sta_rate_tbl_update(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	struct ieee80211_sta_rates *sta_rates = rcu_dereference(sta->rates);
 	int i;
 
+	if (!sta_rates)
+		return;
+
 	spin_lock_bh(&dev->mt76.lock);
 	for (i = 0; i < ARRAY_SIZE(msta->rates); i++) {
 		msta->rates[i].idx = sta_rates->rate[i].idx;
-- 
2.34.1