Re: [PATCH wireless-drivers] mt76: fix possible pktid leak

[Lorenzo Bianconi <lorenzo@kernel.org>]

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> Lorenzo Bianconi <lorenzo@kernel.org> wrote:
> 
> > Fix a possible idr pkt-id leak if the packet is dropped on tx side
> > 
> > Fixes: bd1e3e7b693c ("mt76: introduce packet_id idr")
> > Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> > Acked-by: Felix Fietkau <nbd@nbd.name>
> 
> Patch applied to wireless-drivers.git, thanks.
> 
> 2a9e9857473b mt76: fix possible pktid leak

Hi Kalle,

Unfortunately I found a regression introduced by this patch for mt7663u (and I
guess for mt7921s as well). Do you want me to post a fix or just a v2?
Sorry for the noise.

@Sean: can you please test the following patch on mt7921s? (I do not have the hw).

Regards,
Lorenzo

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c b/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
index bfe6c1579dc1..c51c1d82083e 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/usb_sdio.c
@@ -43,10 +43,9 @@ EXPORT_SYMBOL_GPL(mt7663_usb_sdio_reg_map);
 static void
 mt7663_usb_sdio_write_txwi(struct mt7615_dev *dev, struct mt76_wcid *wcid,
 			   enum mt76_txq_id qid, struct ieee80211_sta *sta,
-			   int pid, struct sk_buff *skb)
+			   struct ieee80211_key_conf *key, int pid,
+			   struct sk_buff *skb)
 {
-	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-	struct ieee80211_key_conf *key = info->control.hw_key;
 	__le32 *txwi;
 
 	txwi = (__le32 *)(skb->data - MT_USB_TXD_SIZE);
@@ -188,6 +187,7 @@ int mt7663_usb_sdio_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 	struct mt7615_dev *dev = container_of(mdev, struct mt7615_dev, mt76);
 	struct sk_buff *skb = tx_info->skb;
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	struct ieee80211_key_conf *key = info->control.hw_key;
 	struct mt7615_sta *msta;
 	int pad, err, pktid;
 
@@ -205,7 +205,7 @@ int mt7663_usb_sdio_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 	}
 
 	pktid = mt76_tx_status_skb_add(&dev->mt76, wcid, skb);
-	mt7663_usb_sdio_write_txwi(dev, wcid, qid, sta, pktid, skb);
+	mt7663_usb_sdio_write_txwi(dev, wcid, qid, sta, key, pktid, skb);
 	if (mt76_is_usb(mdev)) {
 		u32 len = skb->len;
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c
index 85b3d88f8ecc..c7d54e5c8392 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c
@@ -142,10 +142,9 @@ int mt7921s_mac_reset(struct mt7921_dev *dev)
 static void
 mt7921s_write_txwi(struct mt7921_dev *dev, struct mt76_wcid *wcid,
 		   enum mt76_txq_id qid, struct ieee80211_sta *sta,
-		   int pid, struct sk_buff *skb)
+		   struct ieee80211_key_conf *key, int pid,
+		   struct sk_buff *skb)
 {
-	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-	struct ieee80211_key_conf *key = info->control.hw_key;
 	__le32 *txwi;
 
 	txwi = (__le32 *)(skb->data - MT_SDIO_TXD_SIZE);
@@ -161,6 +160,7 @@ int mt7921s_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 {
 	struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76);
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx_info->skb);
+	struct ieee80211_key_conf *key = info->control.hw_key;
 	struct sk_buff *skb = tx_info->skb;
 	int err, pad, pktid;
 
@@ -180,7 +180,7 @@ int mt7921s_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 	}
 
 	pktid = mt76_tx_status_skb_add(&dev->mt76, wcid, skb);
-	mt7921s_write_txwi(dev, wcid, qid, sta, pktid, skb);
+	mt7921s_write_txwi(dev, wcid, qid, sta, key, pktid, skb);
 
 	mt7921_skb_add_sdio_hdr(skb, MT7921_SDIO_DATA);
 	pad = round_up(skb->len, 4) - skb->len;

> 
> -- 
> https://patchwork.kernel.org/project/linux-wireless/patch/a560caffcc24452fb48af53904bbe5c45ea5db93.1637602268.git.lorenzo@kernel.org/
> 
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
> 

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