[PATCH 4.14 49/51] mac80211: drop robust management frames from unknown TA

From: Greg Kroah-Hartman
Date: Mon Jun 24 2019 - 05:59:37 EST

From: Johannes Berg <johannes.berg@xxxxxxxxx>

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@xxxxxxxxxxxxxxx
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3589,6 +3589,8 @@ static bool ieee80211_accept_frame(struc
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);