[PATCH 1/2] mac80211: Check port authorization in the ieee80211_tx_dequeue() case
STALE2381d
LANDED
From: Johannes Berg <johannes@sipsolutions.net>
Date: 2020-03-26 14:52:00
Also in:
stable
Subsystem:
mac80211, the rest · Maintainers:
Johannes Berg, Linus Torvalds
Landed in mainline as ce2e1ca70307 on 2020-03-26.
From: Jouni Malinen <redacted> 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@vger.kernel.org Signed-off-by: Jouni Malinen <redacted> Signed-off-by: Johannes Berg <redacted> --- 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