linux-kernel - [PATCH 3.16 108/132] mac80211: drop robust management frames from unknown TA

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Message-ID: <lsq.1568989415.510943168@decadent.org.uk>
Date:   Fri, 20 Sep 2019 15:23:35 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Johannes Berg" <johannes.berg@...el.com>
Subject: [PATCH 3.16 108/132] mac80211: drop robust management frames from
 unknown TA

3.16.74-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johannes Berg <johannes.berg@...el.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.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/mac80211/rx.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3084,6 +3084,8 @@ static bool prepare_for_handlers(struct
 	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 &&
 		    !ether_addr_equal(sdata->vif.addr, hdr->addr1)) {
 			if (!(sdata->dev->flags & IFF_PROMISC) ||