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