wifi: cfg80211: Set SSID if it is not already set

When a connection was established without going through
NL80211_CMD_CONNECT, the ssid was never set in the wireless_dev struct.
Now we set it in __cfg80211_connect_result() when it is not already set.

When using a userspace configuration that does not call
cfg80211_connect() (can be checked with breakpoints in the kernel),
this patch should allow `networkctl status device_name` to output the
SSID instead of null.

Cc: stable@vger.kernel.org
Reported-by: NYohan Prod'homme <kernel@zoddo.fr>
Fixes: 7b0a0e3c (wifi: cfg80211: do some rework towards MLO link APIs)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216711Signed-off-by: NMarc Bornand <dev.mbornand@systemb.ch>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

net/wireless/sme.c

@@ -736,6 +736,7 @@ void __cfg80211_connect_result(struct net_device *dev,
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	const struct element *country_elem = NULL;
+	const struct element *ssid;
 	const u8 *country_data;
 	u8 country_datalen;
 #ifdef CONFIG_CFG80211_WEXT
@@ -894,6 +895,22 @@ void __cfg80211_connect_result(struct net_device *dev,
 				   country_data, country_datalen);
 	kfree(country_data);
 
+	if (!wdev->u.client.ssid_len) {
+		rcu_read_lock();
+		for_each_valid_link(cr, link) {
+			ssid = ieee80211_bss_get_elem(cr->links[link].bss,
+						      WLAN_EID_SSID);
+
+			if (!ssid || !ssid->datalen)
+				continue;
+
+			memcpy(wdev->u.client.ssid, ssid->data, ssid->datalen);
+			wdev->u.client.ssid_len = ssid->datalen;
+			break;
+		}
+		rcu_read_unlock();
+	}
+
 	return;
 out:
 	for_each_valid_link(cr, link)