From: Jouni Malinen <jouni@xxxxxxxxxxxxxx>
mac80211 used to check port authorization in the Data frame enqueue case
when going through start_xmit(). However, that authorization status may
change while the frame is waiting in a queue. Add a similar check in the
dequeue case to avoid sending previously accepted frames after
authorization change. This provides additional protection against
potential leaking of frames after a station has been disconnected and
the keys for it are being removed.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jouni Malinen <jouni@xxxxxxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
net/mac80211/tx.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 7dbfb9e3cd84..455eb8e6a459 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -3604,8 +3604,25 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
tx.skb = skb;
tx.sdata = vif_to_sdata(info->control.vif);
- if (txq->sta)
+ if (txq->sta) {
tx.sta = container_of(txq->sta, struct sta_info, sta);
+ /*
+ * Drop unicast frames to unauthorised stations unless they are
+ * EAPOL frames from the local station.
+ */
+ if (unlikely(!ieee80211_vif_is_mesh(&tx.sdata->vif) &&
+ tx.sdata->vif.type != NL80211_IFTYPE_OCB &&
+ !is_multicast_ether_addr(hdr->addr1) &&
+ !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) &&
+ (!(info->control.flags &
+ IEEE80211_TX_CTRL_PORT_CTRL_PROTO) ||
+ !ether_addr_equal(tx.sdata->vif.addr,
+ hdr->addr2)))) {
+ I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
+ ieee80211_free_txskb(&local->hw, skb);
+ goto begin;
+ }
+ }
/*
* The key can be removed while the packet was queued, so need to call
--
2.25.1
