linux-kernel - [PATCH 5.16 0674/1039] mt76: mt7921: fix network buffer leak by txs missing

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Date:   Mon, 24 Jan 2022 19:41:03 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Deren Wu <deren.wu@...iatek.com>,
        Felix Fietkau <nbd@....name>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 0674/1039] mt76: mt7921: fix network buffer leak by txs missing

From: Deren Wu <deren.wu@...iatek.com>

[ Upstream commit e0bf699ad8e52330d848144a9624a067ad588bd6 ]

TXS in mt7921 may be forwared to tx_done event. Should try to catch
TXS information in tx_done event as well.

Signed-off-by: Deren Wu <deren.wu@...iatek.com>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 .../net/wireless/mediatek/mt76/mt7921/mac.c   |  2 +-
 .../net/wireless/mediatek/mt76/mt7921/mcu.c   | 14 ++++++++++
 .../net/wireless/mediatek/mt76/mt7921/mcu.h   | 27 +++++++++++++++++++
 .../wireless/mediatek/mt76/mt7921/mt7921.h    |  1 +
 4 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
index 7228b34c66436..fc21a78b37c49 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
@@ -1072,7 +1072,7 @@ out:
 	return !!skb;
 }
 
-static void mt7921_mac_add_txs(struct mt7921_dev *dev, void *data)
+void mt7921_mac_add_txs(struct mt7921_dev *dev, void *data)
 {
 	struct mt7921_sta *msta = NULL;
 	struct mt76_wcid *wcid;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
index 1cc1c32ca258e..484a8c57b862e 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c
@@ -391,6 +391,17 @@ mt7921_mcu_low_power_event(struct mt7921_dev *dev, struct sk_buff *skb)
 	trace_lp_event(dev, event->state);
 }
 
+static void
+mt7921_mcu_tx_done_event(struct mt7921_dev *dev, struct sk_buff *skb)
+{
+	struct mt7921_mcu_tx_done_event *event;
+
+	skb_pull(skb, sizeof(struct mt7921_mcu_rxd));
+	event = (struct mt7921_mcu_tx_done_event *)skb->data;
+
+	mt7921_mac_add_txs(dev, event->txs);
+}
+
 static void
 mt7921_mcu_rx_unsolicited_event(struct mt7921_dev *dev, struct sk_buff *skb)
 {
@@ -418,6 +429,9 @@ mt7921_mcu_rx_unsolicited_event(struct mt7921_dev *dev, struct sk_buff *skb)
 	case MCU_EVENT_LP_INFO:
 		mt7921_mcu_low_power_event(dev, skb);
 		break;
+	case MCU_EVENT_TX_DONE:
+		mt7921_mcu_tx_done_event(dev, skb);
+		break;
 	default:
 		break;
 	}
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.h b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.h
index edc0c73f8c01c..68cb0ce013dbd 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.h
@@ -91,6 +91,33 @@ enum {
 	MCU_EVENT_COREDUMP = 0xf0,
 };
 
+struct mt7921_mcu_tx_done_event {
+	u8 pid;
+	u8 status;
+	__le16 seq;
+
+	u8 wlan_idx;
+	u8 tx_cnt;
+	__le16 tx_rate;
+
+	u8 flag;
+	u8 tid;
+	u8 rsp_rate;
+	u8 mcs;
+
+	u8 bw;
+	u8 tx_pwr;
+	u8 reason;
+	u8 rsv0[1];
+
+	__le32 delay;
+	__le32 timestamp;
+	__le32 applied_flag;
+	u8 txs[28];
+
+	u8 rsv1[32];
+} __packed;
+
 /* ext event table */
 enum {
 	MCU_EXT_EVENT_RATE_REPORT = 0x87,
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
index d6b823713ba33..96647801850a5 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
@@ -464,4 +464,5 @@ int mt7921s_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 			   struct mt76_tx_info *tx_info);
 void mt7921s_tx_complete_skb(struct mt76_dev *mdev, struct mt76_queue_entry *e);
 bool mt7921s_tx_status_data(struct mt76_dev *mdev, u8 *update);
+void mt7921_mac_add_txs(struct mt7921_dev *dev, void *data);
 #endif
-- 
2.34.1