This is a note to let you know that I've just added the patch titled mac80211: don't look at the PM bit of BAR frames to the 4.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mac80211-don-t-look-at-the-pm-bit-of-bar-frames.patch and it can be found in the queue-4.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 769dc04db3ed8484798aceb015b94deacc2ba557 Mon Sep 17 00:00:00 2001 From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx> Date: Thu, 8 Jun 2017 14:00:49 +0300 Subject: mac80211: don't look at the PM bit of BAR frames From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx> commit 769dc04db3ed8484798aceb015b94deacc2ba557 upstream. When a peer sends a BAR frame with PM bit clear, we should not modify its PM state as madated by the spec in 802.11-20012 10.2.1.2. Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx> Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/mac80211/rx.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -1587,12 +1587,16 @@ ieee80211_rx_h_sta_process(struct ieee80 */ if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) && !ieee80211_has_morefrags(hdr->frame_control) && + !ieee80211_is_back_req(hdr->frame_control) && !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && (rx->sdata->vif.type == NL80211_IFTYPE_AP || rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && - /* PM bit is only checked in frames where it isn't reserved, + /* + * PM bit is only checked in frames where it isn't reserved, * in AP mode it's reserved in non-bufferable management frames * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field) + * BAR frames should be ignored as specified in + * IEEE 802.11-2012 10.2.1.2. */ (!ieee80211_is_mgmt(hdr->frame_control) || ieee80211_is_bufferable_mmpdu(hdr->frame_control))) { Patches currently in stable-queue which might be from emmanuel.grumbach@xxxxxxxxx are queue-4.11/mac80211-don-t-send-smps-action-frame-in-ap-mode-when-not-needed.patch queue-4.11/mac80211-don-t-look-at-the-pm-bit-of-bar-frames.patch