Test that we don't have a memory leak in d2i_ASN1_OBJECT.

Fixes #14667

Reworked test supplied by @smcpeak into a unit test.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14938)

(cherry picked from commit 7c65179ad95d0f6f598ee82e763fce2567fe5802)

1 files changed, 26 insertions, 0 deletions

diff --git a/test/asn1_decode_test.c b/test/asn1_decode_test.c
index c6e1501fa1..3a3ad525ae 100644
--- a/test/asn1_decode_test.c
+++ b/test/asn1_decode_test.c
@@ -12,6 +12,7 @@
 
 #include <openssl/rand.h>
 #include <openssl/asn1t.h>
+#include <openssl/obj_mac.h>
 #include "internal/numbers.h"
 #include "testutil.h"
 
@@ -195,6 +196,30 @@ static int test_invalid_template(void)
     return 0;
 }
 
+static int test_reuse_asn1_object(void)
+{
+    static unsigned char cn_der[] = { 0x06, 0x03, 0x55, 0x04, 0x06 };
+    static unsigned char oid_der[] = {
+        0x06, 0x06, 0x2a, 0x03, 0x04, 0x05, 0x06, 0x07
+    };
+    int ret = 0;
+    ASN1_OBJECT *obj;
+    unsigned char const *p = oid_der;
+
+    /* Create an object that owns dynamically allocated 'sn' and 'ln' fields */
+
+    if (!TEST_ptr(obj = ASN1_OBJECT_create(NID_undef, cn_der, sizeof(cn_der),
+                                           "C", "countryName")))
+        goto err;
+    /* reuse obj - this should not leak sn and ln */
+    if (!TEST_ptr(d2i_ASN1_OBJECT(&obj, &p, sizeof(oid_der))))
+        goto err;
+    ret = 1;
+err:
+    ASN1_OBJECT_free(obj);
+    return ret;
+}
+
 int setup_tests(void)
 {
 #ifndef OPENSSL_NO_DEPRECATED_3_0
@@ -205,5 +230,6 @@ int setup_tests(void)
     ADD_TEST(test_int64);
     ADD_TEST(test_uint64);
     ADD_TEST(test_invalid_template);
+    ADD_TEST(test_reuse_asn1_object);
     return 1;
 }