mac80211: fix suspend vs. authentication race

commit 1a1cb744de160ee70086a77afff605bbc275d291 upstream.

Since Stanislaw's patch removing the quiescing code, mac80211 had
a race regarding suspend vs. authentication: as cfg80211 doesn't
track authentication attempts, it can't abort them. Therefore the
attempts may be kept running while suspending, which can lead to
all kinds of issues, in at least some cases causing an error in
iwlmvm firmware.

Fix this by aborting the authentication attempt when suspending.

Fixes: 12e7f517029d ("mac80211: cleanup generic suspend/resume procedures")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 5e44e3179e02aabaea7b6d455ec5ed656e3691b0..6bd498470138a16f15ef736d8c1ffa47fc4e1f5b 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1385,6 +1385,7 @@ void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata);
 void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata);
 void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
                                  __le16 fc, bool acked);
+void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata);
 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata);
 
 /* IBSS code */

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 8fdbac7f99f7fb1e6fdf9a1821ac7ef388cdeb62..47059ac44e24dd4544ad7bae203b81c8e85b7a27 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -3504,6 +3504,32 @@ static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
 }
 
 #ifdef CONFIG_PM
+void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
+{
+       struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+       u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
+
+       sdata_lock(sdata);
+
+       if (ifmgd->auth_data) {
+               /*
+                * If we are trying to authenticate while suspending, cfg80211
+                * won't know and won't actually abort those attempts, thus we
+                * need to do that ourselves.
+                */
+               ieee80211_send_deauth_disassoc(sdata,
+                                              ifmgd->auth_data->bss->bssid,
+                                              IEEE80211_STYPE_DEAUTH,
+                                              WLAN_REASON_DEAUTH_LEAVING,
+                                              false, frame_buf);
+               ieee80211_destroy_auth_data(sdata, false);
+               cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
+                                     IEEE80211_DEAUTH_FRAME_LEN);
+       }
+
+       sdata_unlock(sdata);
+}
+
 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
 {
        struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c
index af64fb8e8addb58e5933cc3a45a8043f55659f81..d478b880a0afd676dae699d5b5541c150a7e819f 100644 (file)
--- a/net/mac80211/pm.c
+++ b/net/mac80211/pm.c
@@ -100,10 +100,18 @@ int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
 
        /* remove all interfaces that were created in the driver */
        list_for_each_entry(sdata, &local->interfaces, list) {
-               if (!ieee80211_sdata_running(sdata) ||
-                   sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
-                   sdata->vif.type == NL80211_IFTYPE_MONITOR)
+               if (!ieee80211_sdata_running(sdata))
                        continue;
+               switch (sdata->vif.type) {
+               case NL80211_IFTYPE_AP_VLAN:
+               case NL80211_IFTYPE_MONITOR:
+                       continue;
+               case NL80211_IFTYPE_STATION:
+                       ieee80211_mgd_quiesce(sdata);
+                       break;
+               default:
+                       break;
+               }
 
                drv_remove_interface(local, sdata);
        }