From 72dc46584cec3652c910b7c414e83353a5b536e9 Mon Sep 17 00:00:00 2001
From: Philipp Stephani <phst@google.com>
Date: Wed, 30 Dec 2020 22:17:52 +0100
Subject: [PATCH] * src/nsterm.m (ns_select): Fix off-by-one error, and add
 assertion

---
 src/nsterm.m | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/nsterm.m b/src/nsterm.m
index 161677484f9..1a23fc6912c 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -4697,7 +4697,8 @@ ns_select (int nfds, fd_set *readfds, fd_set *writefds,
       return -1;
     }
 
-  for (k = 0; k < nfds+1; k++)
+  eassert (nfds <= FD_SETSIZE);
+  for (k = 0; k < nfds; k++)
     {
       if (readfds && FD_ISSET(k, readfds)) ++nr;
       if (writefds && FD_ISSET(k, writefds)) ++nr;
-- 
2.39.5