From 24d47355e177ff615de36eef49ad825c91dff7ef Mon Sep 17 00:00:00 2001
From: Frederick Mayle <fmayle@google.com>
Date: Fri, 13 Sep 2024 11:45:42 -0700
Subject: [PATCH] fix off-by-one error in range check of Backlog::new

---
 src/sys/socket/mod.rs   | 2 +-
 test/sys/test_socket.rs | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/sys/socket/mod.rs b/src/sys/socket/mod.rs
index 99b47a5905..d55ce3aeff 100644
--- a/src/sys/socket/mod.rs
+++ b/src/sys/socket/mod.rs
@@ -2190,7 +2190,7 @@ impl Backlog {
 
         let val = val.into();
 
-        if !(MIN..Self::MAXCONN.0).contains(&val) {
+        if !(MIN..=Self::MAXCONN.0).contains(&val) {
             return Err(Errno::EINVAL);
         }
 
diff --git a/test/sys/test_socket.rs b/test/sys/test_socket.rs
index dae766d0aa..93aa606822 100644
--- a/test/sys/test_socket.rs
+++ b/test/sys/test_socket.rs
@@ -1695,6 +1695,13 @@ pub fn test_named_unixdomain() {
     assert_eq!(&buf[..], b"hello");
 }
 
+#[test]
+pub fn test_listen_maxbacklog() {
+    use nix::sys::socket::Backlog;
+
+    assert!(Backlog::new(libc::SOMAXCONN).is_ok());
+}
+
 #[test]
 pub fn test_listen_wrongbacklog() {
     use nix::sys::socket::Backlog;