diff options
| author | Stanislaw Gruszka <sgruszka@redhat.com> | 2012-03-19 16:00:26 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-04-13 08:33:47 -0700 |
| commit | 53449f46a7b2624a2350f041791882d070cad719 (patch) | |
| tree | 9d6a5558e2c3705e3e8ccc0af4fb4bdb70ab63bd | |
| parent | 3f2d237ff6379e5dd552e9cdb7c2662c0ea89cc8 (diff) | |
mac80211: fix possible tid_rx->reorder_timer use after free
commit d72308bff5c2fa207949a5925b020bce74495e33 upstream.
Is possible that we will arm the tid_rx->reorder_timer after
del_timer_sync() in ___ieee80211_stop_rx_ba_session(). We need to stop
timer after RCU grace period finish, so move it to
ieee80211_free_tid_rx(). Timer will not be armed again, as
rcu_dereference(sta->ampdu_mlme.tid_rx[tid]) will return NULL.
Debug object detected problem with the following warning:
ODEBUG: free active (active state 0) object type: timer_list hint: sta_rx_agg_reorder_timer_expired+0x0/0xf0 [mac80211]
Bug report (with all warning messages):
https://bugzilla.redhat.com/show_bug.cgi?id=804007
Reported-by: "jan p. springer" <jsd@igroup.org>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/mac80211/agg-rx.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c index 41c2310eb3ca..aea15599ab0d 100644 --- a/net/mac80211/agg-rx.c +++ b/net/mac80211/agg-rx.c @@ -49,6 +49,8 @@ static void ieee80211_free_tid_rx(struct rcu_head *h) container_of(h, struct tid_ampdu_rx, rcu_head); int i; + del_timer_sync(&tid_rx->reorder_timer); + for (i = 0; i < tid_rx->buf_size; i++) dev_kfree_skb(tid_rx->reorder_buf[i]); kfree(tid_rx->reorder_buf); @@ -88,7 +90,6 @@ void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, tid, 0, reason); del_timer_sync(&tid_rx->session_timer); - del_timer_sync(&tid_rx->reorder_timer); call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx); } |