[PATCH wireless] mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations

[Felix Fietkau <nbd@nbd.name>]

ieee80211_chan_bw_change() iterates all stations and accesses
link->reserved.oper via sta->sdata->link[link_id]. For stations on
AP_VLAN interfaces (e.g. 4addr WDS clients), sta->sdata points to
the VLAN sdata, whose link never participates in chanctx reservations.
This leaves link->reserved.oper zero-initialized with chan == NULL,
causing a NULL pointer dereference in __ieee80211_sta_cap_rx_bw()
when accessing chandef->chan->band during CSA.

Resolve the VLAN sdata to its parent AP sdata using get_bss_sdata()
before accessing link data.

Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/mac80211/chan.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 4447cf03c41b..f382b144ebac 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -561,13 +561,15 @@ static void ieee80211_chan_bw_change(struct ieee80211_local *local,
 	rcu_read_lock();
 	list_for_each_entry_rcu(sta, &local->sta_list,
 				list) {
-		struct ieee80211_sub_if_data *sdata = sta->sdata;
+		struct ieee80211_sub_if_data *sdata;
 		enum ieee80211_sta_rx_bandwidth new_sta_bw;
 		unsigned int link_id;
 
 		if (!ieee80211_sdata_running(sta->sdata))
 			continue;
 
+		sdata = get_bss_sdata(sta->sdata);
+
 		for (link_id = 0; link_id < ARRAY_SIZE(sta->sdata->link); link_id++) {
 			struct ieee80211_link_data *link =
 				rcu_dereference(sdata->link[link_id]);
-- 
2.51.0