4.4-stable review patch. If anyone has any objections, please let me know.
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From: Emmanuel Grumbach emmanuel.grumbach@intel.com
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 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
--- net/mac80211/rx.c | 1 + 1 file changed, 1 insertion(+)
--- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -1109,6 +1109,7 @@ ieee80211_rx_h_check_dup(struct ieee8021 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;