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Some misconfigured APs broadcast NULL BSSIDs, which can confuse the STA
Ignore those when scanning.

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

--- a/net80211/ieee80211_scan_sta.c
+++ b/net80211/ieee80211_scan_sta.c
@@ -242,6 +242,10 @@
 	struct ieee80211_scan_entry *ise;
 	int hash;
 
+	/* workaround for broken APs that broadcast NULL BSSIDs */
+	if (memcmp(wh->i_addr3, "\x00\x00\x00\x00\x00\x00", 6) == 0)
+		return 0;
+
 	hash = STA_HASH(macaddr);
 	SCAN_STA_LOCK_IRQ(st);
 	LIST_FOREACH(se, &st->st_hash[hash], se_hash)