3.2-stable review patch. If anyone has any objections, please let me know.
------------------
From: Arik Nemtsov <a...@wizery.com>
commit 987c285c2ae2e4e32aca3a9b3252d28171c75711 upstream.
These are accessed without a lock when ending STA PSM. If the
sta_cleanup timer accesses these lists at the same time, we might crash.
This may fix some mysterious crashes we had during
ieee80211_sta_ps_deliver_wakeup.
Signed-off-by: Arik Nemtsov <a...@wizery.com>
Signed-off-by: Ido Yariv <i...@wizery.com>
Signed-off-by: Johannes Berg <johannes.b...@intel.com>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
net/mac80211/sta_info.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 797dd36..89ccd3e 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -961,6 +961,7 @@ void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
struct ieee80211_local *local = sdata->local;
struct sk_buff_head pending;
int filtered = 0, buffered = 0, ac;
+ unsigned long flags;
clear_sta_flag(sta, WLAN_STA_SP);
@@ -976,12 +977,16 @@ void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
int count = skb_queue_len(&pending), tmp;
+ spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
+ spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
tmp = skb_queue_len(&pending);
filtered += tmp - count;
count = tmp;
+ spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
+ spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
tmp = skb_queue_len(&pending);
buffered += tmp - count;
}
--
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