diff options
| author | Arik Nemtsov <arik@wizery.com> | 2012-11-05 10:27:52 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-26 12:14:05 -0800 |
| commit | a64e7f53c0f5d061ccbd8b28fa09b51b32b7ec53 (patch) | |
| tree | ff2169c9d90c1ee78a26f8c98173491a4790fd80 /net | |
| parent | 77d8dd2cf8eff86d9ec00b02d3623702c45ea23e (diff) | |
mac80211: sync acccess to tx_filtered/ps_tx_buf queues
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 <arik@wizery.com>
Signed-off-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/sta_info.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index 63882b991d3a..0318537e86ca 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -948,6 +948,7 @@ 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); @@ -963,12 +964,16 @@ 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; } |