[PATCH 5.9 321/757] mt76: mt7663u: fix dma header initialization

Greg Kroah-Hartman
2020-10-27T15:41:44Z

From: Lorenzo Bianconi <lorenzo@kernel.org>

[ Upstream commit 8da40d698111ad27b03afc40d67843e3073395e7 ]

Fix length field corruption in usb dma header introduced adding sdio
support

Fixes: 75b10f0cbd0b ("mt76: mt76u: add mt76_skb_adjust_pad utility 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/mt7615/usb_mcu.c | 4 +++-
drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c | 7 +++++--
2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/usb_mcu.c b/drivers/net/wireless/mediatek/mt76/mt7615/usb_mcu.c
index 0b33df3e3bfec..adbed373798e8 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/usb_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/usb_mcu.c
@@ -19,6 +19,7 @@ mt7663u_mcu_send_message(struct mt76_dev *mdev, struct sk_buff *skb,
{
struct mt7615_dev *dev = container_of(mdev, struct mt7615_dev, mt76);
int ret, seq, ep;
+ u32 len;

mutex_lock(&mdev->mcu.mutex);

@@ -28,7 +29,8 @@ mt7663u_mcu_send_message(struct mt76_dev *mdev, struct sk_buff *skb,
else
ep = MT_EP_OUT_AC_BE;

- put_unaligned_le32(skb->len, skb_push(skb, sizeof(skb->len)));
+ len = skb->len;
+ put_unaligned_le32(len, skb_push(skb, sizeof(len)));
ret = mt76_skb_adjust_pad(skb);
if (ret < 0)
goto out;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c b/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
index 6dffdaaa9ad53..294276e2280d2 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
@@ -259,8 +259,11 @@ int mt7663_usb_sdio_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
}

mt7663_usb_sdio_write_txwi(dev, wcid, qid, sta, skb);
- if (mt76_is_usb(mdev))
- put_unaligned_le32(skb->len, skb_push(skb, sizeof(skb->len)));
+ if (mt76_is_usb(mdev)) {
+ u32 len = skb->len;
+
+ put_unaligned_le32(len, skb_push(skb, sizeof(len)));
+ }

return mt76_skb_adjust_pad(skb);
}
--
2.25.1