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| author | Felix Fietkau <nbd@openwrt.org> | 2010-07-07 19:42:09 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-10 11:09:18 -0700 |
| commit | caaec883ca2702445d84ff3ee94fe149aeaa95fe (patch) | |
| tree | 441b444e84d147c7a204de24e56feba344c384c4 | |
| parent | a9328d5065468169355a70246bb8ea41d9fc25ef (diff) | |
| download | lwn-caaec883ca2702445d84ff3ee94fe149aeaa95fe.tar.gz lwn-caaec883ca2702445d84ff3ee94fe149aeaa95fe.zip | |
ath9k: fix a buffer leak in A-MPDU completion
commit 73e194639d90594d06d0c10019c0ab4638869135 upstream.
When ath_tx_complete_aggr() is called, it's responsible for returning
all buffers in the linked list. This was not done when the STA lookup
failed, leading to a race condition that could leak a few buffers when
a STA just disconnected.
Fix this by immediately returning all buffers to the free list in this case.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/xmit.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c index 2b305ff204f1..191794ec7eb3 100644 --- a/drivers/net/wireless/ath/ath9k/xmit.c +++ b/drivers/net/wireless/ath/ath9k/xmit.c @@ -329,6 +329,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq, int isaggr, txfail, txpending, sendbar = 0, needreset = 0, nbad = 0; bool rc_update = true; struct ieee80211_tx_rate rates[4]; + unsigned long flags; skb = bf->bf_mpdu; hdr = (struct ieee80211_hdr *)skb->data; @@ -344,6 +345,10 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq, sta = ieee80211_find_sta_by_hw(hw, hdr->addr1); if (!sta) { rcu_read_unlock(); + + spin_lock_irqsave(&sc->tx.txbuflock, flags); + list_splice_tail_init(bf_q, &sc->tx.txbuf); + spin_unlock_irqrestore(&sc->tx.txbuflock, flags); return; } |