P2PS: Fix P2PS-PROV-DONE event on GO

If after P2PS PD the device should become a GO it sends P2PS-PROV-DONE
event which contains the GO interface name. If the GO isn't running yet
the device may use pending interface name. However, when the GO is
started, pending interface name will be removed.

Fix the GO interface name in P2PS-PROV-DONE event by copying the
interface name instead of saving the pointer.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Reviewed-by: Ilan Peer <ilan.peer@intel.com>

wpa_supplicant/p2p_supplicant.c

@@ -3738,16 +3738,26 @@ static void wpas_p2ps_prov_complete(void *ctx, u8 status, const u8 *dev,
 	}
 
 	if (conncap == P2PS_SETUP_GROUP_OWNER) {
-		const char *go_ifname = NULL;
+		/*
+		 * We need to copy the interface name. Simply saving a
+		 * pointer isn't enough, since if we use pending_interface_name
+		 * it will be overwritten when the group is added.
+		 */
+		char go_ifname[100];
+
+		go_ifname[0] = '\0';
 		if (!go_wpa_s) {
 			wpa_s->global->pending_p2ps_group = 1;
 
 			if (!wpas_p2p_create_iface(wpa_s))
-				go_ifname = wpa_s->ifname;
+				os_memcpy(go_ifname, wpa_s->ifname,
+					  sizeof(go_ifname));
 			else if (wpa_s->pending_interface_name[0])
-				go_ifname = wpa_s->pending_interface_name;
+				os_memcpy(go_ifname,
+					  wpa_s->pending_interface_name,
+					  sizeof(go_ifname));
 
-			if (!go_ifname) {
+			if (!go_ifname[0]) {
 				wpas_p2ps_prov_complete(
 					wpa_s, P2P_SC_FAIL_UNKNOWN_GROUP,
 					dev, adv_mac, ses_mac,
@@ -3777,7 +3787,8 @@ static void wpas_p2ps_prov_complete(void *ctx, u8 status, const u8 *dev,
 					MAC2STR(dev));
 			}
 		} else if (passwd_id == DEV_PW_P2PS_DEFAULT) {
-			go_ifname = go_wpa_s->ifname;
+			os_memcpy(go_ifname, go_wpa_s->ifname,
+				  sizeof(go_ifname));
 
 			wpa_dbg(go_wpa_s, MSG_DEBUG,
 				"P2P: Setting PIN-1 For " MACSTR, MAC2STR(dev));