[PATCH] wifi: mac80211: pass 'sta' to ieee80211_rx_data_set_sta()

[Johannes Berg <johannes@xxxxxxxxxxxxxxxx>]

From: Johannes Berg <johannes.berg@xxxxxxxxx>

There's at least one case in ieee80211_rx_for_interface()
where we might pass &((struct sta_info *)NULL)->sta to it
only to then do container_of(), and then checking the
result for NULL, but checking the result of container_of()
for NULL looks really odd.

Fix this by just passing the struct sta_info * instead.

Fixes: e66b7920aa5a ("wifi: mac80211: fix initialization of rx->link and rx->link_sta")
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
 net/mac80211/rx.c | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 7bcd77384191..69aa623163c6 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -4115,13 +4115,8 @@ static bool ieee80211_rx_data_set_link(struct ieee80211_rx_data *rx,
 }
 
 static bool ieee80211_rx_data_set_sta(struct ieee80211_rx_data *rx,
-				      struct ieee80211_sta *pubsta,
-				      int link_id)
+				      struct sta_info *sta, int link_id)
 {
-	struct sta_info *sta;
-
-	sta = container_of(pubsta, struct sta_info, sta);
-
 	rx->link_id = link_id;
 	rx->sta = sta;
 
@@ -4159,7 +4154,7 @@ void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
 	if (sta->sta.valid_links)
 		link_id = ffs(sta->sta.valid_links) - 1;
 
-	if (!ieee80211_rx_data_set_sta(&rx, &sta->sta, link_id))
+	if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
 		return;
 
 	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
@@ -4205,7 +4200,7 @@ void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid,
 
 	sta = container_of(pubsta, struct sta_info, sta);
 
-	if (!ieee80211_rx_data_set_sta(&rx, pubsta, -1))
+	if (!ieee80211_rx_data_set_sta(&rx, sta, -1))
 		return;
 
 	rcu_read_lock();
@@ -4914,6 +4909,7 @@ static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
 	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 	struct ieee80211_fast_rx *fast_rx;
 	struct ieee80211_rx_data rx;
+	struct sta_info *sta;
 	int link_id = -1;
 
 	memset(&rx, 0, sizeof(rx));
@@ -4941,7 +4937,8 @@ static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw,
 	 * link_id is used only for stats purpose and updating the stats on
 	 * the deflink is fine?
 	 */
-	if (!ieee80211_rx_data_set_sta(&rx, pubsta, link_id))
+	sta = container_of(pubsta, struct sta_info, sta);
+	if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
 		goto drop;
 
 	fast_rx = rcu_dereference(rx.sta->fast_rx);
@@ -4981,7 +4978,7 @@ static bool ieee80211_rx_for_interface(struct ieee80211_rx_data *rx,
 			link_id = status->link_id;
 	}
 
-	if (!ieee80211_rx_data_set_sta(rx, &sta->sta, link_id))
+	if (!ieee80211_rx_data_set_sta(rx, sta, link_id))
 		return false;
 
 	return ieee80211_prepare_and_rx_handle(rx, skb, consume);
@@ -5048,7 +5045,8 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
 			link_id = status->link_id;
 
 		if (pubsta) {
-			if (!ieee80211_rx_data_set_sta(&rx, pubsta, link_id))
+			sta = container_of(pubsta, struct sta_info, sta);
+			if (!ieee80211_rx_data_set_sta(&rx, sta, link_id))
 				goto out;
 
 			/*
@@ -5085,8 +5083,7 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
 			}
 
 			rx.sdata = prev_sta->sdata;
-			if (!ieee80211_rx_data_set_sta(&rx, &prev_sta->sta,
-						       link_id))
+			if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
 				goto out;
 
 			if (!status->link_valid && prev_sta->sta.mlo)
@@ -5099,8 +5096,7 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
 
 		if (prev_sta) {
 			rx.sdata = prev_sta->sdata;
-			if (!ieee80211_rx_data_set_sta(&rx, &prev_sta->sta,
-						       link_id))
+			if (!ieee80211_rx_data_set_sta(&rx, prev_sta, link_id))
 				goto out;
 
 			if (!status->link_valid && prev_sta->sta.mlo)
-- 
2.39.1