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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Lorenzo Bianconi <lorenzo@kernel.org>,
        Felix Fietkau <nbd@nbd.name>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.18 434/879] mt76: mt7915: fix possible NULL pointer dereference in mt7915_mac_fill_rx_vector
Date:   Tue,  7 Jun 2022 18:59:12 +0200
Message-Id: <20220607165015.467789454@linuxfoundation.org>
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From: Lorenzo Bianconi <lorenzo@kernel.org>

[ Upstream commit 62fdc974894eec80d678523458cf99bbdb887e22 ]

Fix possible NULL pointer dereference in mt7915_mac_fill_rx_vector
routine if the chip does not support dbdc and the hw reports band_idx
set to 1.

Fixes: 78fc30a21cf11 ("mt76: mt7915: move testmode data from dev to phy")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7915/mac.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index eaa31f5e0b00..fe2b63cf61d8 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -864,8 +864,11 @@ mt7915_mac_fill_rx_vector(struct mt7915_dev *dev, struct sk_buff *skb)
 	int i;
 
 	band_idx = le32_get_bits(rxv_hdr[1], MT_RXV_HDR_BAND_IDX);
-	if (band_idx && !phy->band_idx)
+	if (band_idx && !phy->band_idx) {
 		phy = mt7915_ext_phy(dev);
+		if (!phy)
+			goto out;
+	}
 
 	rcpi = le32_to_cpu(rxv[6]);
 	ib_rssi = le32_to_cpu(rxv[7]);
@@ -890,8 +893,8 @@ mt7915_mac_fill_rx_vector(struct mt7915_dev *dev, struct sk_buff *skb)
 
 	phy->test.last_freq_offset = foe;
 	phy->test.last_snr = snr;
+out:
 #endif
-
 	dev_kfree_skb(skb);
 }
 
-- 
2.35.1