From 3a3f9ed140b0e1feeed1b9655091c270df05332f Mon Sep 17 00:00:00 2001
From: Kurt Roeckx <kurt@roeckx.be>
Date: Wed, 2 Nov 2016 20:45:46 +0100
Subject: [PATCH] conf fuzzer: also check for an empty file

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>

GH: #1828
(cherry picked from commit ea6199ea91ac59ae53686335e436d554cdacd2dc)
---
 fuzz/conf.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/fuzz/conf.c b/fuzz/conf.c
index a76068dd74..30b13c84f9 100644
--- a/fuzz/conf.c
+++ b/fuzz/conf.c
@@ -20,10 +20,15 @@ int FuzzerInitialize(int *argc, char ***argv) {
 }
 
 int FuzzerTestOneInput(const uint8_t *buf, size_t len) {
-    CONF *conf = NCONF_new(NULL);
-    BIO *in = BIO_new(BIO_s_mem());
+    CONF *conf;
+    BIO *in;
     long eline;
 
+    if (len == 0)
+        return 0;
+
+    conf = NCONF_new(NULL);
+    in = BIO_new(BIO_s_mem());
     OPENSSL_assert((size_t)BIO_write(in, buf, len) == len);
     NCONF_load_bio(conf, in, &eline);
     NCONF_free(conf);
-- 
2.25.1