From 32baafb2f6fb2a424824df08232d86765f554880 Mon Sep 17 00:00:00 2001
From: Kurt Roeckx <kurt@roeckx.be>
Date: Sat, 16 Jul 2016 16:56:54 +0200
Subject: [PATCH] Return error when trying to print invalid ASN1 integer

GH: #1322
(cherry picked from commit 5e3553c2de9a365479324b8ba8b998f0cce3e527)

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Stephen Henson <steve@openssl.org>
---
 crypto/asn1/tasn_prn.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/crypto/asn1/tasn_prn.c b/crypto/asn1/tasn_prn.c
index 1dae46bc3d..f628caddbd 100644
--- a/crypto/asn1/tasn_prn.c
+++ b/crypto/asn1/tasn_prn.c
@@ -447,6 +447,8 @@ static int asn1_print_integer_ctx(BIO *out, ASN1_INTEGER *str,
     char *s;
     int ret = 1;
     s = i2s_ASN1_INTEGER(NULL, str);
+    if (s == NULL)
+        return 0;
     if (BIO_puts(out, s) <= 0)
         ret = 0;
     OPENSSL_free(s);