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wifi: mt76: mt792x: Fix memory leak in SDIO TX path

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When tx_prepare_skb() returns an error in the SDIO TX path, the
skb is not freed, leading to a memory leak. This can occur when
zero-length frames (such as WNM NULL frames) are dropped to prevent
potential hardware TX hangs.

Fix this by properly releasing the skb with ieee80211_tx_status_ext()
when tx_prepare_skb() fails.

Fixes: b747fa343817 ("mt76: mt7915: drop zero-length packet to avoid Tx hang")
Signed-off-by: Eason Lai <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Eason Lai
2026-07-21 18:38:04 +02:00
committed by Felix Fietkau
parent cead9778a9
commit da8507851e
1 changed files with 10 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
sdio.c
+10 -1
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@@ -519,6 +519,10 @@ mt76s_tx_queue_skb(struct mt76_phy *phy, struct mt76_queue *q,
enum mt76_txq_id qid, struct sk_buff *skb, enum mt76_txq_id qid, struct sk_buff *skb,
struct mt76_wcid *wcid, struct ieee80211_sta *sta) struct mt76_wcid *wcid, struct ieee80211_sta *sta)
{ {
struct ieee80211_tx_status status = {
.sta = sta,
};
struct mt76_tx_info tx_info = { struct mt76_tx_info tx_info = {
.skb = skb, .skb = skb,
}; };
@@ -531,8 +535,13 @@ mt76s_tx_queue_skb(struct mt76_phy *phy, struct mt76_queue *q,
skb->prev = skb->next = NULL; skb->prev = skb->next = NULL;
err = dev->drv->tx_prepare_skb(dev, NULL, qid, wcid, sta, &tx_info); err = dev->drv->tx_prepare_skb(dev, NULL, qid, wcid, sta, &tx_info);
if (err < 0) if (err < 0) {
status.skb = tx_info.skb;
spin_lock_bh(&dev->rx_lock);
ieee80211_tx_status_ext(dev->hw, &status);
spin_unlock_bh(&dev->rx_lock);
return err; return err;
}
q->entry[q->head].skb = tx_info.skb; q->entry[q->head].skb = tx_info.skb;
q->entry[q->head].buf_sz = len; q->entry[q->head].buf_sz = len;