From 8d85b33eb53ca9ae739aaa6a6f30cb65a1ac6135 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bodo=20M=C3=B6ller?= <bodo@openssl.org>
Date: Fri, 30 Jul 1999 19:22:57 +0000
Subject: [PATCH] by request: let BN_dup(NULL) just return NULL

---
 crypto/bn/bn_lib.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/crypto/bn/bn_lib.c b/crypto/bn/bn_lib.c
index 9c2c9d3238..5d62d88e8b 100644
--- a/crypto/bn/bn_lib.c
+++ b/crypto/bn/bn_lib.c
@@ -489,6 +489,8 @@ BIGNUM *BN_dup(const BIGNUM *a)
 	{
 	BIGNUM *r;
 
+	if (a == NULL) return NULL;
+
 	bn_check_top(a);
 
 	r=BN_new();
-- 
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