queue-4.4/mac80211-drop-robust-management-frames-from-unknown-ta.patch

   1 From 588f7d39b3592a36fb7702ae3b8bdd9be4621e2f Mon Sep 17 00:00:00 2001
   2 From: Johannes Berg <johannes.berg@intel.com>
   3 Date: Wed, 13 Feb 2019 15:13:30 +0100
   4 Subject: mac80211: drop robust management frames from unknown TA
   5
   6 From: Johannes Berg <johannes.berg@intel.com>
   7
   8 commit 588f7d39b3592a36fb7702ae3b8bdd9be4621e2f upstream.
   9
  10 When receiving a robust management frame, drop it if we don't have
  11 rx->sta since then we don't have a security association and thus
  12 couldn't possibly validate the frame.
  13
  14 Cc: stable@vger.kernel.org
  15 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  16 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  17
  18 ---
  19  net/mac80211/rx.c |    2 ++
  20  1 file changed, 2 insertions(+)
  21
  22 --- a/net/mac80211/rx.c
  23 +++ b/net/mac80211/rx.c
  24 @@ -3324,6 +3324,8 @@ static bool ieee80211_accept_frame(struc
  25         case NL80211_IFTYPE_STATION:
  26                 if (!bssid && !sdata->u.mgd.use_4addr)
  27                         return false;
  28 +               if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
  29 +                       return false;
  30                 if (multicast)
  31                         return true;
  32                 return ether_addr_equal(sdata->vif.addr, hdr->addr1);