linux-kernel - [PATCH 6.0 284/862] wifi: mt76: mt7915: fix possible unaligned access in mt7915_mac_add_twt

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Message-Id: <20221019083302.553066406@linuxfoundation.org>
Date:   Wed, 19 Oct 2022 10:26:11 +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, kernel test robot <lkp@...el.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Felix Fietkau <nbd@....name>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.0 284/862] wifi: mt76: mt7915: fix possible unaligned access in mt7915_mac_add_twt_setup

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

[ Upstream commit 3d9aa54355d863e5412a7e08180f50a8f1827b7f ]

Fix possible unaligned pointer in mt7915_mac_add_twt_setup routine.

Reported-by: kernel test robot <lkp@...el.com>
Fixes: 3782b69d03e71 ("mt76: mt7915: introduce mt7915_mac_add_twt_setup routine")
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/mt7915/mac.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index 4ddcd3afa428..49aa5c056063 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -2071,8 +2071,9 @@ void mt7915_mac_add_twt_setup(struct ieee80211_hw *hw,
 	}
 
 	flowid = ffs(~msta->twt.flowid_mask) - 1;
-	le16p_replace_bits(&twt_agrt->req_type, flowid,
-			   IEEE80211_TWT_REQTYPE_FLOWID);
+	twt_agrt->req_type &= ~cpu_to_le16(IEEE80211_TWT_REQTYPE_FLOWID);
+	twt_agrt->req_type |= le16_encode_bits(flowid,
+					       IEEE80211_TWT_REQTYPE_FLOWID);
 
 	table_id = ffs(~dev->twt.table_mask) - 1;
 	exp = FIELD_GET(IEEE80211_TWT_REQTYPE_WAKE_INT_EXP, req_type);
@@ -2122,8 +2123,9 @@ void mt7915_mac_add_twt_setup(struct ieee80211_hw *hw,
 unlock:
 	mutex_unlock(&dev->mt76.mutex);
 out:
-	le16p_replace_bits(&twt_agrt->req_type, setup_cmd,
-			   IEEE80211_TWT_REQTYPE_SETUP_CMD);
+	twt_agrt->req_type &= ~cpu_to_le16(IEEE80211_TWT_REQTYPE_SETUP_CMD);
+	twt_agrt->req_type |=
+		le16_encode_bits(setup_cmd, IEEE80211_TWT_REQTYPE_SETUP_CMD);
 	twt->control = (twt->control & IEEE80211_TWT_CONTROL_WAKE_DUR_UNIT) |
 		       (twt->control & IEEE80211_TWT_CONTROL_RX_DISABLED);
 }
-- 
2.35.1