event_base_once: fix potential null pointer threat

supposing if base is null, EVBASE_ACQUIRE_LOCK and EVBASE_RELEASE_LOCK would get a coredump, so we add a guard for protection. Signed-off-by: chenguolong <[email protected]>
shuxingyx · Feb 15, 2020 · 968bbd5 · 968bbd5
1 parent 5fbe631
commit 968bbd5
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/event.c b/event.c
@@ -2091,6 +2091,9 @@ event_base_once(struct event_base *base, evutil_socket_t fd, short events,
 	int res = 0;
 	int activate = 0;
 
+	if (!base)
+		return (-1);
+
 	/* We cannot support signals that just fire once, or persistent
 	 * events. */
 	if (events & (EV_SIGNAL|EV_PERSIST))