linux-kernel - [PATCH AUTOSEL 6.6 15/20] wifi: mt76: mt7921: fix NULL pointer access in mt7921_ipv6_addr

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Message-ID: <20241012112715.1763241-15-sashal@kernel.org>
Date: Sat, 12 Oct 2024 07:26:47 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Bert Karwatzki <spasswolf@....de>,
	Felix Fietkau <nbd@....name>,
	Kalle Valo <kvalo@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	lorenzo@...nel.org,
	ryder.lee@...iatek.com,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	sean.wang@...iatek.com,
	deren.wu@...iatek.com,
	mingyen.hsieh@...iatek.com,
	johannes.berg@...el.com,
	hao.zhang@...iatek.com,
	emmanuel.grumbach@...el.com,
	leon.yen@...iatek.com,
	linux-wireless@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.6 15/20] wifi: mt76: mt7921: fix NULL pointer access in mt7921_ipv6_addr_change

From: Bert Karwatzki <spasswolf@....de>

[ Upstream commit 479ffee68d59c599f8aed8fa2dcc8e13e7bd13c3 ]

When disabling wifi mt7921_ipv6_addr_change() is called as a notifier.
At this point mvif->phy is already NULL so we cannot use it here.

Signed-off-by: Bert Karwatzki <spasswolf@....de>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Kalle Valo <kvalo@...nel.org>
Link: https://patch.msgid.link/20240812104542.80760-1-spasswolf@web.de
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7921/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index d8851cb5f400b..da17a29a4ce57 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -1095,7 +1095,7 @@ static void mt7921_ipv6_addr_change(struct ieee80211_hw *hw,
 				    struct inet6_dev *idev)
 {
 	struct mt792x_vif *mvif = (struct mt792x_vif *)vif->drv_priv;
-	struct mt792x_dev *dev = mvif->phy->dev;
+	struct mt792x_dev *dev = mt792x_hw_dev(hw);
 	struct inet6_ifaddr *ifa;
 	struct in6_addr ns_addrs[IEEE80211_BSS_ARP_ADDR_LIST_LEN];
 	struct sk_buff *skb;
-- 
2.43.0