[PATCH] Handle obtaining bssid failure

Masashi Honma masashi.honma at gmail.com
Fri Jul 13 09:00:45 EDT 2012


On the ordinally case, the flow is like Fig.1.

wpa_supplicant <--(EVENT_ASSOC event )--  device driver
wpa_supplicant  --( get_bssid()      )--> device driver
wpa_supplicant <--( return BSSID     )--  device driver
Fig.1. Ordinally case

There is a device driver causes Fig.2 case.
The device driver returns EINVAL for get_bssid() because it recognizes it has
already been disconnected.
When the wpa_supplicant received EINVAL, the wpa_supplicant recognized that
it's own BSSID is 00:00:00:00:00:00.

wpa_supplicant <--(EVENT_ASSOC event )--  device driver
                                          device driver (receive deauth)
wpa_supplicant  --( get_bssid()      )--> device driver
wpa_supplicant <--( return EINVAL    )--  device driver
Fig.2. Invalid case


This patch solves this issue.


diff --git a/wpa_supplicant/events.c b/wpa_supplicant/events.c
index 59b103e..5b7c14a 100644
--- a/wpa_supplicant/events.c
+++ b/wpa_supplicant/events.c
@@ -1523,9 +1523,15 @@ static void wpa_supplicant_event_assoc(struct
wpa_supplicant *wpa_s,
 	if (data && wpa_supplicant_event_associnfo(wpa_s, data) < 0)
 		return;

+	if (wpa_drv_get_bssid(wpa_s, bssid) < 0) {
+		wpa_dbg(wpa_s, MSG_ERROR, "Failed to get BSSID");
+		wpa_supplicant_disassociate(
+			wpa_s, WLAN_REASON_DEAUTH_LEAVING);
+		return;
+	}
+
 	wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATED);
-	if (wpa_drv_get_bssid(wpa_s, bssid) >= 0 &&
-	    os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0) {
+	if (os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0) {
 		wpa_dbg(wpa_s, MSG_DEBUG, "Associated to a new BSS: BSSID="
 			MACSTR, MAC2STR(bssid));
 		random_add_randomness(bssid, ETH_ALEN);


Regards,
Masashi Honma.


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