wifi: mac80211: fix locking in auth/assoc timeout

If we hit an authentication or association timeout, we only
release the chanctx for the deflink, and the other link(s)
are released later by ieee80211_vif_set_links(), but we're
not locking this correctly.

Fix the locking here while releasing the channels and links.

Change-Id: I9e08c1a5434592bdc75253c1abfa6c788f9f39b1
Fixes: 81151ce462e5 ("wifi: mac80211: support MLO authentication/association with one link")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 4c40f04..5265d2b 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -3420,11 +3420,11 @@ static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
                ieee80211_link_info_change_notify(sdata, &sdata->deflink,
                                                  BSS_CHANGED_BSSID);
                sdata->u.mgd.flags = 0;
+
                mutex_lock(&sdata->local->mtx);
                ieee80211_link_release_channel(&sdata->deflink);
-               mutex_unlock(&sdata->local->mtx);
-
                ieee80211_vif_set_links(sdata, 0);
+               mutex_unlock(&sdata->local->mtx);
        }
 
        cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
@@ -3462,10 +3462,6 @@ static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
                sdata->u.mgd.flags = 0;
                sdata->vif.bss_conf.mu_mimo_owner = false;
 
-               mutex_lock(&sdata->local->mtx);
-               ieee80211_link_release_channel(&sdata->deflink);
-               mutex_unlock(&sdata->local->mtx);
-
                if (status != ASSOC_REJECTED) {
                        struct cfg80211_assoc_failure data = {
                                .timeout = status == ASSOC_TIMEOUT,
@@ -3484,7 +3480,10 @@ static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
                        cfg80211_assoc_failure(sdata->dev, &data);
                }
 
+               mutex_lock(&sdata->local->mtx);
+               ieee80211_link_release_channel(&sdata->deflink);
                ieee80211_vif_set_links(sdata, 0);
+               mutex_unlock(&sdata->local->mtx);
        }
 
        kfree(assoc_data);