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authorStanislaw Gruszka <sgruszka@redhat.com>2012-03-19 16:00:26 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-13 08:33:47 -0700
commit53449f46a7b2624a2350f041791882d070cad719 (patch)
tree9d6a5558e2c3705e3e8ccc0af4fb4bdb70ab63bd
parent3f2d237ff6379e5dd552e9cdb7c2662c0ea89cc8 (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.c3
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);
}