From 2292814049256980c6e809ab364ebe0da3c9d76a Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Fri, 24 Jul 2020 11:19:17 +0200
Subject: [PATCH] createUnixDomainSocket(): Fix off-by-one error in copying the
 socket path

Reported by Kane York.
---
 src/libutil/util.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 93798a765..a0a8ff4d3 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -1581,7 +1581,7 @@ AutoCloseFD createUnixDomainSocket(const Path & path, mode_t mode)
 
     struct sockaddr_un addr;
     addr.sun_family = AF_UNIX;
-    if (path.size() >= sizeof(addr.sun_path))
+    if (path.size() + 1 >= sizeof(addr.sun_path))
         throw Error("socket path '%1%' is too long", path);
     strcpy(addr.sun_path, path.c_str());