linux-kernel - [PATCH 4.9 138/329] mac80211: drop frames with unexpected DS bits from fast-rx to slow path

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Message-Id: <20180528100254.094876414@linuxfoundation.org>
Date:   Mon, 28 May 2018 12:01:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Felix Fietkau <nbd@....name>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 138/329] mac80211: drop frames with unexpected DS bits from fast-rx to slow path

4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Felix Fietkau <nbd@....name>

[ Upstream commit b323ac19b7734a1c464b2785a082ee50bccd3b91 ]

Fixes rx for 4-addr packets in AP mode. These may be used for setting
up a 4-addr link for stations that are allowed to do so.

Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/mac80211/rx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3907,7 +3907,7 @@ static bool ieee80211_invoke_fast_rx(str
 	if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS |
 					      IEEE80211_FCTL_TODS)) !=
 	    fast_rx->expected_ds_bits)
-		goto drop;
+		return false;
 
 	/* assign the key to drop unencrypted frames (later)
 	 * and strip the IV/MIC if necessary