From 1a913bddd98eed5c7db902ef4ff26138112265b7 Mon Sep 17 00:00:00 2001
From: "Roger A. Light" <roger@atchoo.org>
Date: Wed, 2 May 2018 21:21:07 +0100
Subject: [PATCH] Fix realpath() usage for nonexistant files.

---
 src/mosquitto_passwd.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/mosquitto_passwd.c b/src/mosquitto_passwd.c
index 1b479a4f..33a1cc0b 100644
--- a/src/mosquitto_passwd.c
+++ b/src/mosquitto_passwd.c
@@ -444,8 +444,16 @@ int main(int argc, char *argv[])
 #else
 	password_file = realpath(password_file_tmp, NULL);
 	if(!password_file){
-		fprintf(stderr, "Error reading password file: %s\n", strerror(errno));
-		return 1;
+		if(errno == ENOENT){
+			password_file = strdup(password_file_tmp);
+			if(!password_file){
+				fprintf(stderr, "Error: Out of memory.\n");
+				return 1;
+			}
+		}else{
+			fprintf(stderr, "Error reading password file: %s\n", strerror(errno));
+			return 1;
+		}
 	}
 #endif