From: Nick Porter <nick@portercomputing.co.uk>
Date: Thu, 15 Jul 2021 16:55:33 +0000 (+0100)
Subject: Don't call a function which hasn't been defined
X-Git-Tag: release-1.13.2rc1~36^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F510%2Fhead;p=thirdparty%2Funbound.git

Don't call a function which hasn't been defined
---

diff --git a/util/ub_event_pluggable.c b/util/ub_event_pluggable.c
index 235bba6ba..4280d4db1 100644
--- a/util/ub_event_pluggable.c
+++ b/util/ub_event_pluggable.c
@@ -666,7 +666,8 @@ ub_winsock_tcp_wouldblock(struct ub_event* ev, int eventbits)
 		fptr_ok(ev->vmt != &default_event_vmt ||
 			ev->vmt->winsock_tcp_wouldblock ==
 			my_winsock_tcp_wouldblock);
-		(*ev->vmt->winsock_tcp_wouldblock)(ev, eventbits);
+		if (ev->vmt->winsock_tcp_wouldblock)
+			(*ev->vmt->winsock_tcp_wouldblock)(ev, eventbits);
 	}
 }