wifi: mac80211: fix potential sta-link leak

[ Upstream commit b01a74b ] When a station is allocated, links are added but not set to valid yet (e.g. during connection to an AP MLD), we might remove the station without ever marking links valid, and leak them. Fix that. Fixes: cb71f1d ("wifi: mac80211: add sta link addition/removal") Signed-off-by: Johannes Berg <[email protected]> Reviewed-by: Ilan Peer <[email protected]> Signed-off-by: Miri Korenblit <[email protected]> Link: https://msgid.link/20240111181514.6573998beaf8.I09ac2e1d41c80f82a5a616b8bd1d9d8dd709a6a6@changeid Signed-off-by: Johannes Berg <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
mj22226 · Jan 30, 2024 · d42a58a · d42a58a
1 parent a7f43b6
commit d42a58a
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
@@ -396,7 +396,10 @@ void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(sta->link); i++) {
-		if (!(sta->sta.valid_links & BIT(i)))
+		struct link_sta_info *link_sta;
+
+		link_sta = rcu_access_pointer(sta->link[i]);
+		if (!link_sta)
 			continue;
 
 		sta_remove_link(sta, i, false);