tree 2d6d7e5336f8da1035ca3d92fa14dc1d2abb8ba3
parent 9ec1190d065998650fd9260dea8cf3e1f56c0e8c
author Emmanuel Grumbach <emmanuel.grumbach@intel.com> 1543864567 +0200
committer Johannes Berg <johannes.berg@intel.com> 1544009689 +0100

mac80211: ignore NullFunc frames in the duplicate detection

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>