linux-kernel - [PATCH 4.4 042/143] mac80211: fix radiotap vendor presence bitmap handling

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Date:   Mon, 18 Feb 2019 14:42:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johannes Berg <johannes.berg@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 042/143] mac80211: fix radiotap vendor presence bitmap handling

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

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

[ Upstream commit efc38dd7d5fa5c8cdd0c917c5d00947aa0539443 ]

Due to the alignment handling, it actually matters where in the code
we add the 4 bytes for the presence bitmap to the length; the first
field is the timestamp with 8 byte alignment so we need to add the
space for the extra vendor namespace presence bitmap *before* we do
any alignment for the fields.

Move the presence bitmap length accounting to the right place to fix
the alignment for the data properly.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/mac80211/rx.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 64f76f88f819..acacceec8cd8 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -149,6 +149,9 @@ ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 	/* allocate extra bitmaps */
 	if (status->chains)
 		len += 4 * hweight8(status->chains);
+	/* vendor presence bitmap */
+	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)
+		len += 4;
 
 	if (ieee80211_have_rx_timestamp(status)) {
 		len = ALIGN(len, 8);
@@ -185,8 +188,6 @@ ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
 	if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
 		struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
 
-		/* vendor presence bitmap */
-		len += 4;
 		/* alignment for fixed 6-byte vendor data header */
 		len = ALIGN(len, 2);
 		/* vendor data header */
-- 
2.19.1