linux-kernel - [PATCH AUTOSEL 5.16 029/109] mt76: mt7921: fix crash when startup fails.

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Message-Id: <20220401143256.1950537-29-sashal@kernel.org>
Date:   Fri,  1 Apr 2022 10:31:36 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ben Greear <greearb@...delatech.com>, Felix Fietkau <nbd@....name>,
        Sasha Levin <sashal@...nel.org>, lorenzo.bianconi83@...il.com,
        ryder.lee@...iatek.com, kvalo@...nel.org, davem@...emloft.net,
        kuba@...nel.org, pabeni@...hat.com, matthias.bgg@...il.com,
        sean.wang@...iatek.com, johannes.berg@...el.com,
        deren.wu@...iatek.com, YN.Chen@...iatek.com,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.16 029/109] mt76: mt7921: fix crash when startup fails.

From: Ben Greear <greearb@...delatech.com>

[ Upstream commit 827e7799c61b978fbc2cc9dac66cb62401b2b3f0 ]

If the nic fails to start, it is possible that the
reset_work has already been scheduled.  Ensure the
work item is canceled so we do not have use-after-free
crash in case cleanup is called before the work item
is executed.

This fixes crash on my x86_64 apu2 when mt7921k radio
fails to work.  Radio still fails, but OS does not
crash.

Signed-off-by: Ben Greear <greearb@...delatech.com>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7921/main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 8c55562c1a8d..b3bd090a13f4 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -260,6 +260,7 @@ static void mt7921_stop(struct ieee80211_hw *hw)
 
 	cancel_delayed_work_sync(&dev->pm.ps_work);
 	cancel_work_sync(&dev->pm.wake_work);
+	cancel_work_sync(&dev->reset_work);
 	mt76_connac_free_pending_tx_skbs(&dev->pm, NULL);
 
 	mt7921_mutex_acquire(dev);
-- 
2.34.1