[PATCH 5.19 244/717] wifi: mt76: mt7915: fix possible unaligned access in mt7915_mac_add_twt_setup

Greg Kroah-Hartman
2022-10-22T07:56:44Z

From: Lorenzo Bianconi <lorenzo@kernel.org>

[ Upstream commit 3d9aa54355d863e5412a7e08180f50a8f1827b7f ]

Fix possible unaligned pointer in mt7915_mac_add_twt_setup routine.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: 3782b69d03e71 ("mt76: mt7915: introduce mt7915_mac_add_twt_setup routine")
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 | 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 89f10bf885ba..4f3a3a88f086 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -2536,8 +2536,9 @@ 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);
@@ -2587,8 +2588,9 @@ 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