From: chenguolong <cgl.chenguolong@huawei.com>
Date: Tue, 4 Feb 2020 08:05:02 +0000 (+0800)
Subject: event_base_once: fix potential null pointer threat
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=968bbd5c918568eb95b493af05c464ddfc36671b;p=libevent

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 <cgl.chenguolong@huawei.com>
---

diff --git a/event.c b/event.c
index ff4e79c8..29a2c6d5 100644
--- 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))