From e7498968e229a4ec27702a3703826873a279a07b Mon Sep 17 00:00:00 2001
From: Andy Polyakov <appro@openssl.org>
Date: Tue, 20 Sep 2016 17:08:03 +0200
Subject: [PATCH] rand/randfile.c: treat empty string in RAND_file_name as
 error.

Suggested in GH#1589.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 7dc0ad4d6dca81a003be7fa1fbd58a55f4be8646)
---
 crypto/rand/randfile.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/rand/randfile.c b/crypto/rand/randfile.c
index dfec2c7d6b..c96383a431 100644
--- a/crypto/rand/randfile.c
+++ b/crypto/rand/randfile.c
@@ -362,5 +362,5 @@ const char *RAND_file_name(char *buf, size_t size)
             return NULL;
         }
 #endif
-    return buf;
+    return buf[0] ? buf : NULL;
 }
-- 
2.25.1