[PATCH 4.19 082/175] wifi: mac80211: check/clear fast rx for non-4addr sta VLAN changes

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

------------------

From: Felix Fietkau <nbd@xxxxxxxx>

commit 4f2bdb3c5e3189297e156b3ff84b140423d64685 upstream.

When moving a station out of a VLAN and deleting the VLAN afterwards, the
fast_rx entry still holds a pointer to the VLAN's netdev, which can cause
use-after-free bugs. Fix this by immediately calling ieee80211_check_fast_rx
after the VLAN change.

Cc: stable@xxxxxxxxxxxxxxx
Reported-by: ranygh@xxxxxxxxxx
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Link: https://msgid.link/20240316074336.40442-1-nbd@xxxxxxxx
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/mac80211/cfg.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1548,15 +1548,14 @@ static int ieee80211_change_station(stru
 		}
 
 		if (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
-		    sta->sdata->u.vlan.sta) {
-			ieee80211_clear_fast_rx(sta);
+		    sta->sdata->u.vlan.sta)
 			RCU_INIT_POINTER(sta->sdata->u.vlan.sta, NULL);
-		}
 
 		if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
 			ieee80211_vif_dec_num_mcast(sta->sdata);
 
 		sta->sdata = vlansdata;
+		ieee80211_check_fast_rx(sta);
 		ieee80211_check_fast_xmit(sta);
 
 		if (test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {






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