[ 3.5.y.z extended stable ] Patch "mac80211: call skb_dequeue/ieee80211_free_txskb instead of" has been added to staging queue

[Herton Ronaldo Krzesinski]

This is a note to let you know that I have just added a patch titled

    mac80211: call skb_dequeue/ieee80211_free_txskb instead of

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

>From 914eff941bdd2dc5098850054a26d68c021a491d Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd at openwrt.org>
Date: Sat, 10 Nov 2012 03:44:14 +0100
Subject: [PATCH] mac80211: call skb_dequeue/ieee80211_free_txskb instead of
 __skb_queue_purge

commit 1f98ab7fef48a2968f37f422c256c9fbd978c3f0 upstream.

Fixes more wifi status skb leaks, leading to hostapd/wpa_supplicant hangs.

Signed-off-by: Felix Fietkau <nbd at openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 net/mac80211/ieee80211_i.h |    2 ++
 net/mac80211/sta_info.c    |    6 +++---
 net/mac80211/status.c      |    9 +++++++++
 net/mac80211/tx.c          |    9 ++++++---
 4 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 3f3cd50..98dab42 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1319,6 +1319,8 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
 					 struct net_device *dev);
 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
 				       struct net_device *dev);
+void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
+			      struct sk_buff_head *skbs);

 /* HT */
 void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 343484c..6c74f1e 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -738,8 +738,8 @@ int __must_check __sta_info_destroy(struct sta_info *sta)

 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 		local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
-		__skb_queue_purge(&sta->ps_tx_buf[ac]);
-		__skb_queue_purge(&sta->tx_filtered[ac]);
+		ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
+		ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
 	}

 #ifdef CONFIG_MAC80211_MESH
@@ -774,7 +774,7 @@ int __must_check __sta_info_destroy(struct sta_info *sta)
 		tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
 		if (!tid_tx)
 			continue;
-		__skb_queue_purge(&tid_tx->pending);
+		ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
 		kfree(tid_tx);
 	}

diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index d64dc07..1c697ef 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -666,3 +666,12 @@ void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
 	dev_kfree_skb_any(skb);
 }
 EXPORT_SYMBOL(ieee80211_free_txskb);
+
+void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
+			      struct sk_buff_head *skbs)
+{
+	struct sk_buff *skb;
+
+	while ((skb = __skb_dequeue(skbs)))
+		ieee80211_free_txskb(hw, skb);
+}
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index a22a1ad..d417c48 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1370,7 +1370,7 @@ static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
 		if (tx->skb)
 			ieee80211_free_txskb(&tx->local->hw, tx->skb);
 		else
-			__skb_queue_purge(&tx->skbs);
+			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
 		return -1;
 	} else if (unlikely(res == TX_QUEUED)) {
 		I802_DEBUG_INC(tx->local->tx_handlers_queued);
@@ -2147,10 +2147,13 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
  */
 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
 {
+	struct sk_buff *skb;
 	int i;

-	for (i = 0; i < local->hw.queues; i++)
-		skb_queue_purge(&local->pending[i]);
+	for (i = 0; i < local->hw.queues; i++) {
+		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
+			ieee80211_free_txskb(&local->hw, skb);
+	}
 }

 /*
--
1.7.9.5