FT: Fix WMM TSPEC validation in driver-based AP MLME case

Commit 88b32a99d30894b2d6bb391371c442fc117edbab ('FT: Add FT AP support
for drivers that manage MLME internally') added an alternative way of
processing the WMM TSPEC from RIC. However, that change did not seem to
include the same checks for WMM TSPEC element length that were used in
the original implementation for MLME-in-hostapd case. Fix this by
sharing the older implementation of copying the WMM TSPEC from RIC for
both cases.

It looks like the destination buffer for the response is sufficiently
long for the fixed length copy, but it may have been possible to trigger
a read beyond the end of the FTIE by about 50 bytes. Though, that seems
to be within the buffer received for RX buffer in the case that uses
this driver-based AP MLME design for FT.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/ap/wpa_auth_ft.c

@@ -534,10 +534,8 @@ static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
 		return pos;
 	}
 
-#ifdef NEED_AP_MLME
-	if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
+	if (parse.wmm_tspec) {
 		struct wmm_tspec_element *tspec;
-		int res;
 
 		if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
 			wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
@@ -555,7 +553,13 @@ static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
 		}
 		tspec = (struct wmm_tspec_element *) pos;
 		os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
-		res = wmm_process_tspec(tspec);
+	}
+
+#ifdef NEED_AP_MLME
+	if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
+		int res;
+
+		res = wmm_process_tspec((struct wmm_tspec_element *) pos);
 		wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
 		if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
 			rdie->status_code =
@@ -566,20 +570,17 @@ static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
 		else {
 			/* TSPEC accepted; include updated TSPEC in response */
 			rdie->descr_count = 1;
-			pos += sizeof(*tspec);
+			pos += sizeof(struct wmm_tspec_element);
 		}
 		return pos;
 	}
 #endif /* NEED_AP_MLME */
 
 	if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
-		struct wmm_tspec_element *tspec;
 		int res;
 
-		tspec = (struct wmm_tspec_element *) pos;
-		os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
 		res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
-				       sizeof(*tspec));
+				       sizeof(struct wmm_tspec_element));
 		if (res >= 0) {
 			if (res)
 				rdie->status_code = host_to_le16(res);
@@ -587,7 +588,7 @@ static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
 				/* TSPEC accepted; include updated TSPEC in
 				 * response */
 				rdie->descr_count = 1;
-				pos += sizeof(*tspec);
+				pos += sizeof(struct wmm_tspec_element);
 			}
 			return pos;
 		}