6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Peter Chiu <chui-hao.chiu@xxxxxxxxxxxx>
[ Upstream commit f98c3de92bb05dac4a4969df8a4595ed380b4604 ]
The chainmask is u16 so using hweight8 cannot get correct tx_ant.
Without this patch, the tx_ant of band 2 would be -1 and lead to the
following issue:
BUG: KASAN: stack-out-of-bounds in mt7996_mcu_add_sta+0x12e0/0x16e0 [mt7996e]
Fixes: 98686cd21624 ("wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices")
Signed-off-by: Peter Chiu <chui-hao.chiu@xxxxxxxxxxxx>
Signed-off-by: Shayne Chen <shayne.chen@xxxxxxxxxxxx>
Link: https://patch.msgid.link/20240816094635.2391-1-shayne.chen@xxxxxxxxxxxx
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/wireless/mediatek/mt76/mt7996/mcu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
index b66f712e1b17b..1c3eec84892c2 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
@@ -1412,7 +1412,7 @@ mt7996_mcu_sta_bfer_tlv(struct mt7996_dev *dev, struct sk_buff *skb,
{
struct mt7996_vif *mvif = (struct mt7996_vif *)vif->drv_priv;
struct mt7996_phy *phy = mvif->phy;
- int tx_ant = hweight8(phy->mt76->chainmask) - 1;
+ int tx_ant = hweight16(phy->mt76->chainmask) - 1;
struct sta_rec_bf *bf;
struct tlv *tlv;
const u8 matrix[4][4] = {
--
2.43.0
