From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 14 Jun 2024 14:41:16 +0200
Subject: [PATCH] nl80211: fix crash when adding an interface fails

When adding an interface fails early, the bss link is still NULL.
Avoid crashing on deleting beacons.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

--- a/src/drivers/driver_nl80211.c
+++ b/src/drivers/driver_nl80211.c
@@ -3071,7 +3071,7 @@ static int wpa_driver_nl80211_del_beacon
 	struct wpa_driver_nl80211_data *drv = bss->drv;
 	struct i802_link *link = nl80211_get_link(bss, link_id);
 
-	if (!link->beacon_set)
+	if (!link || !link->beacon_set)
 		return 0;
 
 	wpa_printf(MSG_DEBUG, "nl80211: Remove beacon (ifindex=%d)",