From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from nbd.name ([88.198.39.176]:48127 "EHLO ds10.nbd.name" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753099Ab0GGRmU (ORCPT ); Wed, 7 Jul 2010 13:42:20 -0400 From: Felix Fietkau To: linux-wireless@vger.kernel.org Cc: linville@tuxdriver.com, lrodriguez@atheros.com Subject: [PATCH 1/2] ath9k: fix a potential buffer leak in the STA teardown path Date: Wed, 7 Jul 2010 19:42:08 +0200 Message-Id: <1278524529-30246-1-git-send-email-nbd@openwrt.org> Sender: linux-wireless-owner@vger.kernel.org List-ID: It looks like it might be possible for a TID to be paused, while still holding some queued buffers, however ath_tx_node_cleanup currently only iterates over active TIDs. Fix this by always checking every allocated TID for the STA that is being cleaned up. Signed-off-by: Felix Fietkau Cc: stable@kernel.org --- drivers/net/wireless/ath/ath9k/xmit.c | 52 ++++++++++++++++---------------- 1 files changed, 26 insertions(+), 26 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c index c3681a1..408d1c5 100644 --- a/drivers/net/wireless/ath/ath9k/xmit.c +++ b/drivers/net/wireless/ath/ath9k/xmit.c @@ -2430,37 +2430,37 @@ void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an) void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an) { - int i; - struct ath_atx_ac *ac, *ac_tmp; - struct ath_atx_tid *tid, *tid_tmp; + struct ath_atx_ac *ac; + struct ath_atx_tid *tid; struct ath_txq *txq; + int i, tidno; - for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) { - if (ATH_TXQ_SETUP(sc, i)) { - txq = &sc->tx.txq[i]; + for (tidno = 0, tid = &an->tid[tidno]; + tidno < WME_NUM_TID; tidno++, tid++) { + i = tid->ac->qnum; - spin_lock_bh(&txq->axq_lock); + if (!ATH_TXQ_SETUP(sc, i)) + continue; - list_for_each_entry_safe(ac, - ac_tmp, &txq->axq_acq, list) { - tid = list_first_entry(&ac->tid_q, - struct ath_atx_tid, list); - if (tid && tid->an != an) - continue; - list_del(&ac->list); - ac->sched = false; - - list_for_each_entry_safe(tid, - tid_tmp, &ac->tid_q, list) { - list_del(&tid->list); - tid->sched = false; - ath_tid_drain(sc, txq, tid); - tid->state &= ~AGGR_ADDBA_COMPLETE; - tid->state &= ~AGGR_CLEANUP; - } - } + txq = &sc->tx.txq[i]; + ac = tid->ac; - spin_unlock_bh(&txq->axq_lock); + spin_lock_bh(&txq->axq_lock); + + if (tid->sched) { + list_del(&tid->list); + tid->sched = false; + } + + if (ac->sched) { + list_del(&ac->list); + tid->ac->sched = false; } + + ath_tid_drain(sc, txq, tid); + tid->state &= ~AGGR_ADDBA_COMPLETE; + tid->state &= ~AGGR_CLEANUP; + + spin_unlock_bh(&txq->axq_lock); } } -- 1.6.4.2