From 9ef1f848a646565d4dd86e56542cf921d4921ad9 Mon Sep 17 00:00:00 2001
From: xkernel <xkernel.wang@foxmail.com>
Date: Mon, 20 Jun 2022 17:46:39 +0800
Subject: [PATCH] v3_sxnet: add a check for the return of i2s_ASN1_INTEGER()

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/18608)
---
 crypto/x509/v3_sxnet.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/crypto/x509/v3_sxnet.c b/crypto/x509/v3_sxnet.c
index a433196820..5ac3bab354 100644
--- a/crypto/x509/v3_sxnet.c
+++ b/crypto/x509/v3_sxnet.c
@@ -78,6 +78,8 @@ static int sxnet_i2r(X509V3_EXT_METHOD *method, SXNET *sx, BIO *out,
     for (i = 0; i < sk_SXNETID_num(sx->ids); i++) {
         id = sk_SXNETID_value(sx->ids, i);
         tmp = i2s_ASN1_INTEGER(NULL, id->zone);
+        if (tmp == NULL)
+            return 0;
         BIO_printf(out, "\n%*sZone: %s, User: ", indent, "", tmp);
         OPENSSL_free(tmp);
         ASN1_STRING_print(out, id->user);