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Subject[PATCH 3.16 265/305] mac80211: ignore NullFunc frames in the duplicate detection
3.16.63-rc1 review patch.  If anyone has any objections, please let me know.


From: Emmanuel Grumbach <>

commit 990d71846a0b7281bd933c34d734e6afc7408e7e upstream.

NullFunc packets should never be duplicate just like
QoS-NullFunc packets.

We saw a client that enters / exits power save with
NullFunc frames (and not with QoS-NullFunc) despite the
fact that the association supports HT.
This specific client also re-uses a non-zero sequence number
for different NullFunc frames.
At some point, the client had to send a retransmission of
the NullFunc frame and we dropped it, leading to a
misalignment in the power save state.
Fix this by never consider a NullFunc frame as duplicate,
just like we do for QoS NullFunc frames.

This fixes

Signed-off-by: Emmanuel Grumbach <>
Signed-off-by: Johannes Berg <>
[bwh: Backported to 3.16: The condition for "should we check for duplication"
is in ieee80211_rx_h_check() and is not inverted]
Signed-off-by: Ben Hutchings <>
net/mac80211/rx.c | 1 +
1 file changed, 1 insertion(+)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -967,6 +967,7 @@ ieee80211_rx_h_check(struct ieee80211_rx
if (rx->skb->len >= 24 && rx->sta &&
!ieee80211_is_ctl(hdr->frame_control) &&
+ !ieee80211_is_nullfunc(hdr->frame_control) &&
!ieee80211_is_qos_nullfunc(hdr->frame_control) &&
!is_multicast_ether_addr(hdr->addr1)) {
if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
 \ /
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