diff --git a/crypto/asn1/a_object.c b/crypto/asn1/a_object.c
index 0ef0ac3e8981691ce8dd817e45b9d405582083c2..3978c9150d8c4783516476ffb35777ec859cb51d 100644
--- a/crypto/asn1/a_object.c
+++ b/crypto/asn1/a_object.c
@@ -139,7 +139,7 @@ int a2d_ASN1_OBJECT(unsigned char *out, int olen, const char *buf, int num)
 				ASN1err(ASN1_F_A2D_ASN1_OBJECT,ASN1_R_INVALID_DIGIT);
 				goto err;
 				}
-			if (!use_bn && l >= (ULONG_MAX / 10L))
+			if (!use_bn && l >= ((ULONG_MAX - 80) / 10L))
 				{
 				use_bn = 1;
 				if (!bl)
@@ -293,7 +293,7 @@ ASN1_OBJECT *c2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp,
 	/* Sanity check OID encoding: can't have leading 0x80 in
 	 * subidentifiers, see: X.690 8.19.2
 	 */
-	for (i = 0, p = *pp + 1; i < len - 1; i++, p++)
+	for (i = 0, p = *pp; i < len; i++, p++)
 		{
 		if (*p == 0x80 && (!i || !(p[-1] & 0x80)))
 			{