Delay processing of EAPOL frames when not associated

If an EAPOL frame is received while wpa_supplicant thinks the driver is
not associated, queue the frame for processing at the moment when the
association event is received. This is a workaround to a race condition
in receiving data frames and management events from the kernel.

The pending EAPOL frame will not be processed unless an association
event is received within 100 msec for the same BSSID.

wpa_supplicant/events.c

@@ -943,6 +943,25 @@ static void wpa_supplicant_event_assoc(struct wpa_supplicant *wpa_s,
 		eapol_sm_notify_portValid(wpa_s->eapol, TRUE);
 		eapol_sm_notify_eap_success(wpa_s->eapol, TRUE);
 	}
+
+	if (wpa_s->pending_eapol_rx) {
+		struct os_time now, age;
+		os_get_time(&now);
+		os_time_sub(&now, &wpa_s->pending_eapol_rx_time, &age);
+		if (age.sec == 0 && age.usec < 100000 &&
+		    os_memcmp(wpa_s->pending_eapol_rx_src, bssid, ETH_ALEN) ==
+		    0) {
+			wpa_printf(MSG_DEBUG, "Process pending EAPOL frame "
+				   "that was received just before association "
+				   "notification");
+			wpa_supplicant_rx_eapol(
+				wpa_s, wpa_s->pending_eapol_rx_src,
+				wpabuf_head(wpa_s->pending_eapol_rx),
+				wpabuf_len(wpa_s->pending_eapol_rx));
+		}
+		wpabuf_free(wpa_s->pending_eapol_rx);
+		wpa_s->pending_eapol_rx = NULL;
+	}
 }
 
 

wpa_supplicant/wpa_supplicant.c

@@ -405,6 +405,9 @@ static void wpa_supplicant_cleanup(struct wpa_supplicant *wpa_s)
 
 	wpas_wps_deinit(wpa_s);
 
+	wpabuf_free(wpa_s->pending_eapol_rx);
+	wpa_s->pending_eapol_rx = NULL;
+
 #ifdef CONFIG_IBSS_RSN
 	ibss_rsn_deinit(wpa_s->ibss_rsn);
 	wpa_s->ibss_rsn = NULL;
@@ -1574,6 +1577,27 @@ void wpa_supplicant_rx_eapol(void *ctx, const u8 *src_addr,
 	wpa_printf(MSG_DEBUG, "RX EAPOL from " MACSTR, MAC2STR(src_addr));
 	wpa_hexdump(MSG_MSGDUMP, "RX EAPOL", buf, len);
 
+	if (wpa_s->wpa_state < WPA_ASSOCIATED) {
+		/*
+		 * There is possible race condition between receiving the
+		 * association event and the EAPOL frame since they are coming
+		 * through different paths from the driver. In order to avoid
+		 * issues in trying to process the EAPOL frame before receiving
+		 * association information, lets queue it for processing until
+		 * the association event is received.
+		 */
+		wpa_printf(MSG_DEBUG, "Not associated - Delay processing of "
+			   "received EAPOL frame");
+		wpabuf_free(wpa_s->pending_eapol_rx);
+		wpa_s->pending_eapol_rx = wpabuf_alloc_copy(buf, len);
+		if (wpa_s->pending_eapol_rx) {
+			os_get_time(&wpa_s->pending_eapol_rx_time);
+			os_memcpy(wpa_s->pending_eapol_rx_src, src_addr,
+				  ETH_ALEN);
+		}
+		return;
+	}
+
 #ifdef CONFIG_AP
 	if (wpa_s->ap_iface) {
 		wpa_supplicant_ap_rx_eapol(wpa_s, src_addr, buf, len);

wpa_supplicant/wpa_supplicant_i.h

@@ -364,6 +364,10 @@ struct wpa_supplicant {
 	int wps_success; /* WPS success event received */
 	int blacklist_cleared;
 
+	struct wpabuf *pending_eapol_rx;
+	struct os_time pending_eapol_rx_time;
+	u8 pending_eapol_rx_src[ETH_ALEN];
+
 	struct ibss_rsn *ibss_rsn;
 
 #ifdef CONFIG_SME