From 588f7d39b3592a36fb7702ae3b8bdd9be4621e2f Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Wed, 13 Feb 2019 15:13:30 +0100
Subject: [PATCH] mac80211: drop robust management frames from unknown TA
Git-commit: 588f7d39b3592a36fb7702ae3b8bdd9be4621e2f
Patch-mainline: v5.2-rc6
References: bsc#1051510

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

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

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);
-- 
2.16.4