mac80211: drop robust management frames from unknown TA

BugLink: https://bugs.launchpad.net/bugs/1838824
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: stable@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index db5ba8d4b910b9254349fb3fcd2a8c0d56cc6600..9e17813cfc8e1c702270c61d322cbc2efd2d2d1f 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3594,6 +3594,8 @@ 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);