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Subject[ 115/187] mac80211: clear ifmgd->bssid only after building DELBA
Date
From: Greg KH <gregkh@linuxfoundation.org>

3.4-stable review patch. If anyone has any objections, please let me know.

------------------
From: Eliad Peller <eliad@wizery.com>

commit 88a9e31c506c00c8b7a2f1611406d0e38dcb33b3 upstream.

ieee80211_set_disassoc() clears ifmgd->bssid before
building DELBA frames, resulting in frames with invalid
bssid ("00:00:00:00:00:00").

Fix it by clearing ifmgd->bssid only after building
all the needed frames.

After this change, we no longer need to save the
bssid (before clearing it), so remove the local array.

Reported-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/mac80211/mlme.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1375,7 +1375,6 @@ static void ieee80211_set_disassoc(struc
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
u32 changed = 0;
- u8 bssid[ETH_ALEN];

ASSERT_MGD_MTX(ifmgd);

@@ -1385,10 +1384,7 @@ static void ieee80211_set_disassoc(struc
if (WARN_ON(!ifmgd->associated))
return;

- memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
-
ifmgd->associated = NULL;
- memset(ifmgd->bssid, 0, ETH_ALEN);

/*
* we need to commit the associated = NULL change because the
@@ -1408,7 +1404,7 @@ static void ieee80211_set_disassoc(struc
netif_carrier_off(sdata->dev);

mutex_lock(&local->sta_mtx);
- sta = sta_info_get(sdata, bssid);
+ sta = sta_info_get(sdata, ifmgd->bssid);
if (sta) {
set_sta_flag(sta, WLAN_STA_BLOCK_BA);
ieee80211_sta_tear_down_BA_sessions(sta, tx);
@@ -1417,13 +1413,16 @@ static void ieee80211_set_disassoc(struc

/* deauthenticate/disassociate now */
if (tx || frame_buf)
- ieee80211_send_deauth_disassoc(sdata, bssid, stype, reason,
- tx, frame_buf);
+ ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
+ reason, tx, frame_buf);

/* flush out frame */
if (tx)
drv_flush(local, false);

+ /* clear bssid only after building the needed mgmt frames */
+ memset(ifmgd->bssid, 0, ETH_ALEN);
+
/* remove AP and TDLS peers */
sta_info_flush(local, sdata);




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