[PATCH 5.1 116/121] mac80211: drop robust management frames from unknown TA

[Greg Kroah-Hartman]

From: Johannes Berg <johannes.b...@intel.com>

commit 588f7d39b3592a36fb7702ae3b8bdd9be4621e2f upstream.

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: sta...@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.b...@intel.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 net/mac80211/rx.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3823,6 +3823,8 @@ static bool ieee80211_accept_frame(struc
        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);