From 26196762563f25d48466fb7168fd355d7651adb4 Mon Sep 17 00:00:00 2001
From: Ben Laurie <ben@openssl.org>
Date: Sat, 1 Feb 2003 20:58:59 +0000
Subject: [PATCH] Old-style callbacks can be NULL!

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

diff --git a/crypto/bn/bn_prime.c b/crypto/bn/bn_prime.c
index 6c16029957..fd863933e5 100644
--- a/crypto/bn/bn_prime.c
+++ b/crypto/bn/bn_prime.c
@@ -142,6 +142,8 @@ int BN_GENCB_call(BN_GENCB *cb, int a, int b)
 		{
 	case 1:
 		/* Deprecated-style callbacks */
+		if(!cb->cb.cb_1)
+			return 1;
 		cb->cb.cb_1(a, b, cb->arg);
 		return 1;
 	case 2: