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-rw-r--r--crypto/asn1/t_x509.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/asn1/t_x509.c b/crypto/asn1/t_x509.c
index 8aab55130c95..8888396f8434 100644
--- a/crypto/asn1/t_x509.c
+++ b/crypto/asn1/t_x509.c
@@ -140,7 +140,8 @@ int X509_print_ex(BIO *bp, X509 *x, unsigned long nmflags,
goto err;
bs = X509_get_serialNumber(x);
- if (bs->length <= (int)sizeof(long)) {
+ if (bs->length < (int)sizeof(long)
+ || (bs->length == sizeof(long) && (bs->data[0] & 0x80) == 0)) {
l = ASN1_INTEGER_get(bs);
if (bs->type == V_ASN1_NEG_INTEGER) {
l = -l;