From 069f40fc07f6df3da325e7ea1698a0d6247983d5 Mon Sep 17 00:00:00 2001 From: Stanislaw Gruszka Date: Wed, 20 Apr 2011 16:01:46 +0200 Subject: iwl4965: fix skb usage after free Since commit a120e912eb51e347f36c71b60a1d13af74d30e83 Author: Stanislaw Gruszka Date: Fri Feb 19 15:47:33 2010 -0800 iwlwifi: sanity check before counting number of tfds can be free we use skb->data after calling ieee80211_tx_status_irqsafe(), which could free skb instantly. On current kernels I do not observe practical problems related with bug, but on 2.6.35.y it cause random system hangs when stressing wireless link, making bisection of other problems impossible. Signed-off-by: Stanislaw Gruszka Signed-off-by: John W. Linville --- drivers/net/wireless/iwlegacy/iwl-4965-tx.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'drivers/net/wireless/iwlegacy/iwl-4965-tx.c') diff --git a/drivers/net/wireless/iwlegacy/iwl-4965-tx.c b/drivers/net/wireless/iwlegacy/iwl-4965-tx.c index 5c40502f869a..fbec88d48f1b 100644 --- a/drivers/net/wireless/iwlegacy/iwl-4965-tx.c +++ b/drivers/net/wireless/iwlegacy/iwl-4965-tx.c @@ -1127,12 +1127,16 @@ int iwl4965_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index) q->read_ptr = iwl_legacy_queue_inc_wrap(q->read_ptr, q->n_bd)) { tx_info = &txq->txb[txq->q.read_ptr]; - iwl4965_tx_status(priv, tx_info, - txq_id >= IWL4965_FIRST_AMPDU_QUEUE); + + if (WARN_ON_ONCE(tx_info->skb == NULL)) + continue; hdr = (struct ieee80211_hdr *)tx_info->skb->data; - if (hdr && ieee80211_is_data_qos(hdr->frame_control)) + if (ieee80211_is_data_qos(hdr->frame_control)) nfreed++; + + iwl4965_tx_status(priv, tx_info, + txq_id >= IWL4965_FIRST_AMPDU_QUEUE); tx_info->skb = NULL; priv->cfg->ops->lib->txq_free_tfd(priv, txq); -- cgit v1.2.3 From 16b345d89686ca0482a9ca741a1167def1abdd7f Mon Sep 17 00:00:00 2001 From: Stanislaw Gruszka Date: Fri, 29 Apr 2011 17:51:56 +0200 Subject: iwl4965: fix "Received BA when not expected" Need to use broadcast sta_id for management frames, otherwise we broke BA session in the firmware and get messages like that: "Received BA when not expected" or (on older kernels): "BA scd_flow 0 does not match txq_id 10" This fix regression introduced in 2.6.35 during station management code rewrite by: commit 2a87c26bbe9587baeb9e56d3ce0b4971bd777643 Author: Johannes Berg Date: Fri Apr 30 11:30:45 2010 -0700 iwlwifi: use iwl_find_station less Signed-off-by: Stanislaw Gruszka Signed-off-by: John W. Linville --- drivers/net/wireless/iwlegacy/iwl-4965-tx.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) (limited to 'drivers/net/wireless/iwlegacy/iwl-4965-tx.c') diff --git a/drivers/net/wireless/iwlegacy/iwl-4965-tx.c b/drivers/net/wireless/iwlegacy/iwl-4965-tx.c index fbec88d48f1b..79ac081832fb 100644 --- a/drivers/net/wireless/iwlegacy/iwl-4965-tx.c +++ b/drivers/net/wireless/iwlegacy/iwl-4965-tx.c @@ -316,12 +316,18 @@ int iwl4965_tx_skb(struct iwl_priv *priv, struct sk_buff *skb) hdr_len = ieee80211_hdrlen(fc); - /* Find index into station table for destination station */ - sta_id = iwl_legacy_sta_id_or_broadcast(priv, ctx, info->control.sta); - if (sta_id == IWL_INVALID_STATION) { - IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n", - hdr->addr1); - goto drop_unlock; + /* For management frames use broadcast id to do not break aggregation */ + if (!ieee80211_is_data(fc)) + sta_id = ctx->bcast_sta_id; + else { + /* Find index into station table for destination station */ + sta_id = iwl_legacy_sta_id_or_broadcast(priv, ctx, info->control.sta); + + if (sta_id == IWL_INVALID_STATION) { + IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n", + hdr->addr1); + goto drop_unlock; + } } IWL_DEBUG_TX(priv, "station Id %d\n", sta_id); -- cgit v1.2.3