From: Jouni Malinen jouni@codeaurora.org
commit ce2e1ca703071723ca2dd94d492a5ab6d15050da upstream.
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 jouni@codeaurora.org Link: https://lore.kernel.org/r/20200326155133.ced84317ea29.I34d4c47cd8cc8a4042b38... Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/mac80211/tx.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-)
--- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -3451,8 +3451,25 @@ begin: 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