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mac80211: ignore NullFunc frames in the duplicate detection
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commit 990d718 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 https://bugzilla.kernel.org/show_bug.cgi?id=201449

CC: <stable@vger.kernel.org>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Emmanuel Grumbach authored and Greg Kroah-Hartman committed Dec 13, 2018
1 parent db32c24 commit fd54ea7
Showing 1 changed file with 1 addition and 0 deletions.
1 change: 1 addition & 0 deletions net/mac80211/rx.c
Original file line number Diff line number Diff line change
@@ -1230,6 +1230,7 @@ ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
return RX_CONTINUE;

if (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))
return RX_CONTINUE;

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