4.20-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@intel.com Signed-off-by: Luca Coelho luciano.coelho@intel.com Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Sasha Levin sashal@kernel.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 77d996a60f12..85c365fc7a0c 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -143,6 +143,9 @@ 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); @@ -207,8 +210,6 @@ 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 */