mac80211: drop robust management frames from unknown TA

When receiving a robust management frame, drop it if we don't have
rx->sta since then we don't have a security association and thus
couldn't possibly validate the frame.

Cc: stable@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 25577ede2986..fd3740000e87 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3831,6 +3831,8 @@ static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
         case NL80211_IFTYPE_STATION:
                 if (!bssid && !sdata->u.mgd.use_4addr)
                         return false;
+                if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
+                        return false;
                 if (multicast)
                         return true;
                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);