diff options
| author | Eliad Peller <eliad@wizery.com> | 2011-07-19 13:14:42 +0300 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-07-20 15:04:36 -0400 |
| commit | 0a557ed3a0a4f7e36d76da137b781344f548c464 (patch) | |
| tree | 110e1842e22def99c87581ebe71bc3c32f272b9c | |
| parent | 5966f2ddcda452455f8ab518b7cba221b5234a94 (diff) | |
| download | lwn-0a557ed3a0a4f7e36d76da137b781344f548c464.tar.gz lwn-0a557ed3a0a4f7e36d76da137b781344f548c464.zip | |
mac80211: check sta_info_get() return value
ieee80211_stop_rx_ba_session() was calling sta_info_get()
without rcu locking, and the return value was not
checked.
This resulted in the following panic:
[<bf05726c>] (ieee80211_stop_rx_ba_session+0x0/0x60 [mac80211])
[<bf0abd94>] (wl1271_event_handle+0x0/0xdc8 [wl12xx])
[<bf0a7308>] (wl1271_irq+0x0/0x4a0 [wl12xx])
[<c00c40a8>] (irq_thread+0x0/0x254)
[<c00a7398>] (kthread+0x0/0x8c)
Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
| -rw-r--r-- | net/mac80211/agg-rx.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c index ebadb9ac9a7e..fd1aaf2a4a6c 100644 --- a/net/mac80211/agg-rx.c +++ b/net/mac80211/agg-rx.c @@ -104,14 +104,22 @@ void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap, const u8 *addr) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); - struct sta_info *sta = sta_info_get(sdata, addr); + struct sta_info *sta; int i; + rcu_read_lock(); + sta = sta_info_get(sdata, addr); + if (!sta) { + rcu_read_unlock(); + return; + } + for (i = 0; i < STA_TID_NUM; i++) if (ba_rx_bitmap & BIT(i)) set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested); ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); + rcu_read_unlock(); } EXPORT_SYMBOL(ieee80211_stop_rx_ba_session); |