mac80211: fix AP-mode frame matching

In AP mode, ignore frames with mis-matched BSSID that aren't
multicast or sent to the correct destination. This fixes
reporting public action frames to userspace multiple times
on multiple virtual AP interfaces.

Cc: stable@vger.kernel.org
Reported-by: Jouni Malinen <j@w1.fi>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index c8447af76ead..8e2952620256 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3036,6 +3036,9 @@ static int prepare_for_handlers(struct ieee80211_rx_data *rx,
                          * and location updates. Note that mac80211
                          * itself never looks at these frames.
                          */
+                        if (!multicast &&
+                            !ether_addr_equal(sdata->vif.addr, hdr->addr1))
+                                return 0;
                         if (ieee80211_is_public_action(hdr, skb->len))
                                 return 1;
                         if (!ieee80211_is_beacon(hdr->frame_control))