DPP: Provide peer_mac to PKEX Initiator through function argument

Avoid unnecessary direct write to a struct dpp_pkex member from outside
dpp.c.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/ap/dpp_hostapd.c

@@ -1198,8 +1198,7 @@ hostapd_dpp_rx_pkex_exchange_resp(struct hostapd_data *hapd, const u8 *src,
 		return;
 	}
 
-	os_memcpy(hapd->dpp_pkex->peer_mac, src, ETH_ALEN);
-	msg = dpp_pkex_rx_exchange_resp(hapd->dpp_pkex, buf, len);
+	msg = dpp_pkex_rx_exchange_resp(hapd->dpp_pkex, src, buf, len);
 	if (!msg) {
 		wpa_printf(MSG_DEBUG, "DPP: Failed to process the response");
 		return;

src/common/dpp.c

@@ -6671,6 +6671,7 @@ fail:
 
 
 struct wpabuf * dpp_pkex_rx_exchange_resp(struct dpp_pkex *pkex,
+					  const u8 *peer_mac,
 					  const u8 *buf, size_t buflen)
 {
 	const u8 *attr_status, *attr_id, *attr_key, *attr_group;
@@ -6693,6 +6694,8 @@ struct wpabuf * dpp_pkex_rx_exchange_resp(struct dpp_pkex *pkex,
 	if (pkex->failed || pkex->t >= PKEX_COUNTER_T_LIMIT || !pkex->initiator)
 		return NULL;
 
+	os_memcpy(pkex->peer_mac, peer_mac, ETH_ALEN);
+
 	attr_status = dpp_get_attr(buf, buflen, DPP_ATTR_STATUS,
 				   &attr_status_len);
 	if (!attr_status || attr_status_len != 1) {

src/common/dpp.h

@@ -396,6 +396,7 @@ struct dpp_pkex * dpp_pkex_rx_exchange_req(void *msg_ctx,
 					   const char *code,
 					   const u8 *buf, size_t len);
 struct wpabuf * dpp_pkex_rx_exchange_resp(struct dpp_pkex *pkex,
+					  const u8 *peer_mac,
 					  const u8 *buf, size_t len);
 struct wpabuf * dpp_pkex_rx_commit_reveal_req(struct dpp_pkex *pkex,
 					      const u8 *hdr,

wpa_supplicant/dpp_supplicant.c

@@ -1796,8 +1796,7 @@ wpas_dpp_rx_pkex_exchange_resp(struct wpa_supplicant *wpa_s, const u8 *src,
 	eloop_cancel_timeout(wpas_dpp_pkex_retry_timeout, wpa_s, NULL);
 	wpa_s->dpp_pkex->exch_req_wait_time = 0;
 
-	os_memcpy(wpa_s->dpp_pkex->peer_mac, src, ETH_ALEN);
-	msg = dpp_pkex_rx_exchange_resp(wpa_s->dpp_pkex, buf, len);
+	msg = dpp_pkex_rx_exchange_resp(wpa_s->dpp_pkex, src, buf, len);
 	if (!msg) {
 		wpa_printf(MSG_DEBUG, "DPP: Failed to process the response");
 		return;