From a255d9f0c89b81c795980438a9d358525f8fb2c4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tim=20R=C3=BChsen?= <tim.ruehsen@gmx.de>
Date: Mon, 6 May 2019 16:45:11 +0200
Subject: [PATCH] * src/connect.c (select_fd): Check for negative fd

---
 src/connect.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/connect.c b/src/connect.c
index 7b0dbbd4..14c5aea4 100644
--- a/src/connect.c
+++ b/src/connect.c
@@ -686,6 +686,9 @@ select_fd (int fd, double maxtime, int wait_for)
   struct timeval tmout;
   int result;
 
+  if (fd < 0)
+    return -1;
+
   if (fd >= FD_SETSIZE)
     {
       logprintf (LOG_NOTQUIET, _("Too many fds open.  Cannot use select on a fd >= %d\n"), FD_SETSIZE);