diff --git a/src/fst/fst_group.c b/src/fst/fst_group.c
index a4ae016..321d40d 100644
--- a/src/fst/fst_group.c
+++ b/src/fst/fst_group.c
@@ -29,7 +29,7 @@
 		const struct multi_band_ie *mbie =
 			(const struct multi_band_ie *) p;
 		WPA_ASSERT(mbie->eid == WLAN_EID_MULTI_BAND);
-		WPA_ASSERT(2U + mbie->len >= sizeof(*mbie));
+		WPA_ASSERT(2 + mbie->len >= sizeof(*mbie));
 
 		fst_printf(MSG_WARNING,
 			   "%s: %s: mb_ctrl=%u band_id=%u op_class=%u chan=%u bssid="
diff --git a/src/fst/fst_iface.h b/src/fst/fst_iface.h
index cbaa7d8..0eb2732 100644
--- a/src/fst/fst_iface.h
+++ b/src/fst/fst_iface.h
@@ -106,7 +106,7 @@
 					  const u8 *addr,
 					  const u8 *buf, size_t size)
 {
-	i->iface_obj.update_mb_ie(i->iface_obj.ctx, addr, buf, size);
+	return i->iface_obj.update_mb_ie(i->iface_obj.ctx, addr, buf, size);
 }
 
 static inline const u8 * fst_iface_get_peer_first(struct fst_iface *i,
diff --git a/src/fst/fst_session.c b/src/fst/fst_session.c
index a02a93e..76e2c78 100644
--- a/src/fst/fst_session.c
+++ b/src/fst/fst_session.c
@@ -756,6 +756,8 @@
 	struct fst_session *s;
 	u32 id;
 
+	WPA_ASSERT(!is_zero_ether_addr(own_addr));
+
 	id = fst_find_free_session_id();
 	if (id == FST_INVALID_SESSION_ID) {
 		fst_printf(MSG_ERROR, "Cannot assign new session ID");