test/sslapitest.c:5797: error: INTEGER_OVERFLOW_L2
  ([0, +oo] - 1):unsigned64 by call to `SSL_free`.
Showing all 17 steps of the trace


test/sslapitest.c:5756:10: Call
5754.       }
5755.   
5756.       if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl, &clientssl,
                 ^
5757.                                         NULL, NULL))
5758.               || !TEST_true(create_ssl_connection(serverssl, clientssl,

test/ssltestlib.c:669:15: Call
  667.       if (*sssl != NULL)
  668.           serverssl = *sssl;
  669.       else if (!TEST_ptr(serverssl = SSL_new(serverctx)))
                       ^
  670.           goto error;
  671.       if (*cssl != NULL)

ssl/ssl_lib.c:671:1: Parameter `ctx->sessions->num_items`
    669.   }
    670.   
    671. > SSL *SSL_new(SSL_CTX *ctx)
    672.   {
    673.       SSL *s;

test/sslapitest.c:5797:5: Call
5795.   
5796.    end:
5797.       SSL_free(serverssl);
            ^
5798.       SSL_free(clientssl);
5799.       SSL_CTX_free(sctx);

ssl/ssl_lib.c:1133:1: Parameter `s->session_ctx->sessions->num_items`
  1131.   }
  1132.   
  1133. > void SSL_free(SSL *s)
  1134.   {
  1135.       int i;

ssl/ssl_lib.c:1164:9: Call
  1162.       /* Make the next call work :-) */
  1163.       if (s->session != NULL) {
  1164.           ssl_clear_bad_session(s);
                  ^
  1165.           SSL_SESSION_free(s->session);
  1166.       }

ssl/ssl_sess.c:1124:1: Parameter `s->session_ctx->sessions->num_items`
    1122.   }
    1123.   
    1124. > int ssl_clear_bad_session(SSL *s)
    1125.   {
    1126.       if ((s->session != NULL) &&

ssl/ssl_sess.c:1129:9: Call
    1127.           !(s->shutdown & SSL_SENT_SHUTDOWN) &&
    1128.           !(SSL_in_init(s) || SSL_in_before(s))) {
    1129.           SSL_CTX_remove_session(s->session_ctx, s->session);
                    ^
    1130.           return 1;
    1131.       } else

ssl/ssl_sess.c:742:1: Parameter `ctx->sessions->num_items`
      740.   }
      741.   
      742. > int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
      743.   {
      744.       return remove_session_lock(ctx, c, 1);

ssl/ssl_sess.c:744:12: Call
      742.   int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)
      743.   {
      744.       return remove_session_lock(ctx, c, 1);
                        ^
      745.   }
      746.   

ssl/ssl_sess.c:747:1: Parameter `ctx->sessions->num_items`
        745.   }
        746.   
        747. > static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)
        748.   {
        749.       SSL_SESSION *r;

ssl/ssl_sess.c:757:17: Call
        755.           if ((r = lh_SSL_SESSION_retrieve(ctx->sessions, c)) != NULL) {
        756.               ret = 1;
        757.               r = lh_SSL_SESSION_delete(ctx->sessions, r);
                               ^
        758.               SSL_SESSION_list_remove(ctx, r);
        759.           }

ssl/ssl_locl.h:732:1: Parameter `lh->num_items`
          730.   } TLSEXT_INDEX;
          731.   
          732. > DEFINE_LHASH_OF(SSL_SESSION);
          733.   /* Needed in ssl_cert.c */
          734.   DEFINE_LHASH_OF(X509_NAME);

ssl/ssl_locl.h:732:1: Call
          730.   } TLSEXT_INDEX;
          731.   
          732. > DEFINE_LHASH_OF(SSL_SESSION);
          733.   /* Needed in ssl_cert.c */
          734.   DEFINE_LHASH_OF(X509_NAME);

crypto/lhash/lhash.c:128:1: <LHS trace>
126.   }
127.   
128. > void *OPENSSL_LH_delete(OPENSSL_LHASH *lh, const void *data)
129.   {
130.       unsigned long hash;

crypto/lhash/lhash.c:128:1: Parameter `lh->num_items`
            126.   }
            127.   
            128. > void *OPENSSL_LH_delete(OPENSSL_LHASH *lh, const void *data)
            129.   {
            130.       unsigned long hash;

crypto/lhash/lhash.c:148:5: Binary operation: ([0, +oo] - 1):unsigned64 by call to `SSL_free` 
            146.       }
            147.   
            148.       lh->num_items--;
                       ^
            149.       if ((lh->num_nodes > MIN_NODES) &&
            150.           (lh->down_load >= (lh->num_items * LH_LOAD_MULT / lh->num_nodes)))

void *OPENSSL_LH_delete(OPENSSL_LHASH *lh, const void *data)
{
    unsigned long hash;
    OPENSSL_LH_NODE *nn, **rn;
    void *ret;
    lh->error = 0;
    rn = getrn(lh, data, &hash);
    if (*rn == NULL) {
        lh->num_no_delete++;
        return NULL;
    } else {
        nn = *rn;
        *rn = nn->next;
        ret = nn->data;
        OPENSSL_free(nn);
        lh->num_delete++;
    }
    lh->num_items--;
    if ((lh->num_nodes > MIN_NODES) &&
        (lh->down_load >= (lh->num_items * LH_LOAD_MULT / lh->num_nodes)))
        contract(lh);
    return ret;
}
['static int test_ca_names_int(int prot, int tst)\n{\n    SSL_CTX *cctx = NULL, *sctx = NULL;\n    SSL *clientssl = NULL, *serverssl = NULL;\n    int testresult = 0;\n    size_t i;\n    X509_NAME *name[] = { NULL, NULL, NULL, NULL };\n    char *strnames[] = { "Jack", "Jill", "John", "Joanne" };\n    STACK_OF(X509_NAME) *sk1 = NULL, *sk2 = NULL;\n    const STACK_OF(X509_NAME) *sktmp = NULL;\n    for (i = 0; i < OSSL_NELEM(name); i++) {\n        name[i] = X509_NAME_new();\n        if (!TEST_ptr(name[i])\n                || !TEST_true(X509_NAME_add_entry_by_txt(name[i], "CN",\n                                                         MBSTRING_ASC,\n                                                         (unsigned char *)\n                                                         strnames[i],\n                                                         -1, -1, 0)))\n            goto end;\n    }\n    if (!TEST_true(create_ssl_ctx_pair(TLS_server_method(),\n                                       TLS_client_method(),\n                                       TLS1_VERSION,\n                                       prot,\n                                       &sctx, &cctx, cert, privkey)))\n        goto end;\n    SSL_CTX_set_verify(sctx, SSL_VERIFY_PEER, NULL);\n    if (tst == 0 || tst == 1) {\n        if (!TEST_ptr(sk1 = sk_X509_NAME_new_null())\n                || !TEST_true(sk_X509_NAME_push(sk1, X509_NAME_dup(name[0])))\n                || !TEST_true(sk_X509_NAME_push(sk1, X509_NAME_dup(name[1])))\n                || !TEST_ptr(sk2 = sk_X509_NAME_new_null())\n                || !TEST_true(sk_X509_NAME_push(sk2, X509_NAME_dup(name[0])))\n                || !TEST_true(sk_X509_NAME_push(sk2, X509_NAME_dup(name[1]))))\n            goto end;\n        SSL_CTX_set0_CA_list(sctx, sk1);\n        SSL_CTX_set0_CA_list(cctx, sk2);\n        sk1 = sk2 = NULL;\n    }\n    if (tst == 1 || tst == 2) {\n        if (!TEST_ptr(sk1 = sk_X509_NAME_new_null())\n                || !TEST_true(sk_X509_NAME_push(sk1, X509_NAME_dup(name[2])))\n                || !TEST_true(sk_X509_NAME_push(sk1, X509_NAME_dup(name[3])))\n                || !TEST_ptr(sk2 = sk_X509_NAME_new_null())\n                || !TEST_true(sk_X509_NAME_push(sk2, X509_NAME_dup(name[2])))\n                || !TEST_true(sk_X509_NAME_push(sk2, X509_NAME_dup(name[3]))))\n            goto end;\n        SSL_CTX_set_client_CA_list(sctx, sk1);\n        SSL_CTX_set_client_CA_list(cctx, sk2);\n        sk1 = sk2 = NULL;\n    }\n    if (!TEST_true(create_ssl_objects(sctx, cctx, &serverssl, &clientssl,\n                                      NULL, NULL))\n            || !TEST_true(create_ssl_connection(serverssl, clientssl,\n                                                SSL_ERROR_NONE)))\n        goto end;\n    sktmp = SSL_get0_peer_CA_list(serverssl);\n    if (prot == TLS1_3_VERSION\n            && (tst == 0 || tst == 1)) {\n        if (!TEST_ptr(sktmp)\n                || !TEST_int_eq(sk_X509_NAME_num(sktmp), 2)\n                || !TEST_int_eq(X509_NAME_cmp(sk_X509_NAME_value(sktmp, 0),\n                                              name[0]), 0)\n                || !TEST_int_eq(X509_NAME_cmp(sk_X509_NAME_value(sktmp, 1),\n                                              name[1]), 0))\n            goto end;\n    } else if (!TEST_ptr_null(sktmp)) {\n        goto end;\n    }\n    sktmp = SSL_get0_peer_CA_list(clientssl);\n    if (!TEST_ptr(sktmp)\n            || !TEST_int_eq(sk_X509_NAME_num(sktmp), 2)\n            || !TEST_int_eq(X509_NAME_cmp(sk_X509_NAME_value(sktmp, 0),\n                                          name[tst == 0 ? 0 : 2]), 0)\n            || !TEST_int_eq(X509_NAME_cmp(sk_X509_NAME_value(sktmp, 1),\n                                          name[tst == 0 ? 1 : 3]), 0))\n        goto end;\n    testresult = 1;\n end:\n    SSL_free(serverssl);\n    SSL_free(clientssl);\n    SSL_CTX_free(sctx);\n    SSL_CTX_free(cctx);\n    for (i = 0; i < OSSL_NELEM(name); i++)\n        X509_NAME_free(name[i]);\n    sk_X509_NAME_pop_free(sk1, X509_NAME_free);\n    sk_X509_NAME_pop_free(sk2, X509_NAME_free);\n    return testresult;\n}', 'int create_ssl_objects(SSL_CTX *serverctx, SSL_CTX *clientctx, SSL **sssl,\n                          SSL **cssl, BIO *s_to_c_fbio, BIO *c_to_s_fbio)\n{\n    SSL *serverssl = NULL, *clientssl = NULL;\n    BIO *s_to_c_bio = NULL, *c_to_s_bio = NULL;\n    if (*sssl != NULL)\n        serverssl = *sssl;\n    else if (!TEST_ptr(serverssl = SSL_new(serverctx)))\n        goto error;\n    if (*cssl != NULL)\n        clientssl = *cssl;\n    else if (!TEST_ptr(clientssl = SSL_new(clientctx)))\n        goto error;\n    if (SSL_is_dtls(clientssl)) {\n        if (!TEST_ptr(s_to_c_bio = BIO_new(bio_s_mempacket_test()))\n                || !TEST_ptr(c_to_s_bio = BIO_new(bio_s_mempacket_test())))\n            goto error;\n    } else {\n        if (!TEST_ptr(s_to_c_bio = BIO_new(BIO_s_mem()))\n                || !TEST_ptr(c_to_s_bio = BIO_new(BIO_s_mem())))\n            goto error;\n    }\n    if (s_to_c_fbio != NULL\n            && !TEST_ptr(s_to_c_bio = BIO_push(s_to_c_fbio, s_to_c_bio)))\n        goto error;\n    if (c_to_s_fbio != NULL\n            && !TEST_ptr(c_to_s_bio = BIO_push(c_to_s_fbio, c_to_s_bio)))\n        goto error;\n    BIO_set_mem_eof_return(s_to_c_bio, -1);\n    BIO_set_mem_eof_return(c_to_s_bio, -1);\n    SSL_set_bio(serverssl, c_to_s_bio, s_to_c_bio);\n    BIO_up_ref(s_to_c_bio);\n    BIO_up_ref(c_to_s_bio);\n    SSL_set_bio(clientssl, s_to_c_bio, c_to_s_bio);\n    *sssl = serverssl;\n    *cssl = clientssl;\n    return 1;\n error:\n    SSL_free(serverssl);\n    SSL_free(clientssl);\n    BIO_free(s_to_c_bio);\n    BIO_free(c_to_s_bio);\n    BIO_free(s_to_c_fbio);\n    BIO_free(c_to_s_fbio);\n    return 0;\n}', 'SSL *SSL_new(SSL_CTX *ctx)\n{\n    SSL *s;\n    if (ctx == NULL) {\n        SSLerr(SSL_F_SSL_NEW, SSL_R_NULL_SSL_CTX);\n        return NULL;\n    }\n    if (ctx->method == NULL) {\n        SSLerr(SSL_F_SSL_NEW, SSL_R_SSL_CTX_HAS_NO_DEFAULT_SSL_VERSION);\n        return NULL;\n    }\n    s = OPENSSL_zalloc(sizeof(*s));\n    if (s == NULL)\n        goto err;\n    s->references = 1;\n    s->lock = CRYPTO_THREAD_lock_new();\n    if (s->lock == NULL) {\n        OPENSSL_free(s);\n        s = NULL;\n        goto err;\n    }\n    RECORD_LAYER_init(&s->rlayer, s);\n    s->options = ctx->options;\n    s->dane.flags = ctx->dane.flags;\n    s->min_proto_version = ctx->min_proto_version;\n    s->max_proto_version = ctx->max_proto_version;\n    s->mode = ctx->mode;\n    s->max_cert_list = ctx->max_cert_list;\n    s->max_early_data = ctx->max_early_data;\n    s->recv_max_early_data = ctx->recv_max_early_data;\n    s->num_tickets = ctx->num_tickets;\n    s->pha_enabled = ctx->pha_enabled;\n    s->tls13_ciphersuites = sk_SSL_CIPHER_dup(ctx->tls13_ciphersuites);\n    if (s->tls13_ciphersuites == NULL)\n        goto err;\n    s->cert = ssl_cert_dup(ctx->cert);\n    if (s->cert == NULL)\n        goto err;\n    RECORD_LAYER_set_read_ahead(&s->rlayer, ctx->read_ahead);\n    s->msg_callback = ctx->msg_callback;\n    s->msg_callback_arg = ctx->msg_callback_arg;\n    s->verify_mode = ctx->verify_mode;\n    s->not_resumable_session_cb = ctx->not_resumable_session_cb;\n    s->record_padding_cb = ctx->record_padding_cb;\n    s->record_padding_arg = ctx->record_padding_arg;\n    s->block_padding = ctx->block_padding;\n    s->sid_ctx_length = ctx->sid_ctx_length;\n    if (!ossl_assert(s->sid_ctx_length <= sizeof(s->sid_ctx)))\n        goto err;\n    memcpy(&s->sid_ctx, &ctx->sid_ctx, sizeof(s->sid_ctx));\n    s->verify_callback = ctx->default_verify_callback;\n    s->generate_session_id = ctx->generate_session_id;\n    s->param = X509_VERIFY_PARAM_new();\n    if (s->param == NULL)\n        goto err;\n    X509_VERIFY_PARAM_inherit(s->param, ctx->param);\n    s->quiet_shutdown = ctx->quiet_shutdown;\n    s->ext.max_fragment_len_mode = ctx->ext.max_fragment_len_mode;\n    s->max_send_fragment = ctx->max_send_fragment;\n    s->split_send_fragment = ctx->split_send_fragment;\n    s->max_pipelines = ctx->max_pipelines;\n    if (s->max_pipelines > 1)\n        RECORD_LAYER_set_read_ahead(&s->rlayer, 1);\n    if (ctx->default_read_buf_len > 0)\n        SSL_set_default_read_buffer_len(s, ctx->default_read_buf_len);\n    SSL_CTX_up_ref(ctx);\n    s->ctx = ctx;\n    s->ext.debug_cb = 0;\n    s->ext.debug_arg = NULL;\n    s->ext.ticket_expected = 0;\n    s->ext.status_type = ctx->ext.status_type;\n    s->ext.status_expected = 0;\n    s->ext.ocsp.ids = NULL;\n    s->ext.ocsp.exts = NULL;\n    s->ext.ocsp.resp = NULL;\n    s->ext.ocsp.resp_len = 0;\n    SSL_CTX_up_ref(ctx);\n    s->session_ctx = ctx;\n#ifndef OPENSSL_NO_EC\n    if (ctx->ext.ecpointformats) {\n        s->ext.ecpointformats =\n            OPENSSL_memdup(ctx->ext.ecpointformats,\n                           ctx->ext.ecpointformats_len);\n        if (!s->ext.ecpointformats)\n            goto err;\n        s->ext.ecpointformats_len =\n            ctx->ext.ecpointformats_len;\n    }\n    if (ctx->ext.supportedgroups) {\n        s->ext.supportedgroups =\n            OPENSSL_memdup(ctx->ext.supportedgroups,\n                           ctx->ext.supportedgroups_len\n                                * sizeof(*ctx->ext.supportedgroups));\n        if (!s->ext.supportedgroups)\n            goto err;\n        s->ext.supportedgroups_len = ctx->ext.supportedgroups_len;\n    }\n#endif\n#ifndef OPENSSL_NO_NEXTPROTONEG\n    s->ext.npn = NULL;\n#endif\n    if (s->ctx->ext.alpn) {\n        s->ext.alpn = OPENSSL_malloc(s->ctx->ext.alpn_len);\n        if (s->ext.alpn == NULL)\n            goto err;\n        memcpy(s->ext.alpn, s->ctx->ext.alpn, s->ctx->ext.alpn_len);\n        s->ext.alpn_len = s->ctx->ext.alpn_len;\n    }\n    s->verified_chain = NULL;\n    s->verify_result = X509_V_OK;\n    s->default_passwd_callback = ctx->default_passwd_callback;\n    s->default_passwd_callback_userdata = ctx->default_passwd_callback_userdata;\n    s->method = ctx->method;\n    s->key_update = SSL_KEY_UPDATE_NONE;\n    s->allow_early_data_cb = ctx->allow_early_data_cb;\n    s->allow_early_data_cb_data = ctx->allow_early_data_cb_data;\n    if (!s->method->ssl_new(s))\n        goto err;\n    s->server = (ctx->method->ssl_accept == ssl_undefined_function) ? 0 : 1;\n    if (!SSL_clear(s))\n        goto err;\n    if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data))\n        goto err;\n#ifndef OPENSSL_NO_PSK\n    s->psk_client_callback = ctx->psk_client_callback;\n    s->psk_server_callback = ctx->psk_server_callback;\n#endif\n    s->psk_find_session_cb = ctx->psk_find_session_cb;\n    s->psk_use_session_cb = ctx->psk_use_session_cb;\n    s->job = NULL;\n#ifndef OPENSSL_NO_CT\n    if (!SSL_set_ct_validation_callback(s, ctx->ct_validation_callback,\n                                        ctx->ct_validation_callback_arg))\n        goto err;\n#endif\n    return s;\n err:\n    SSL_free(s);\n    SSLerr(SSL_F_SSL_NEW, ERR_R_MALLOC_FAILURE);\n    return NULL;\n}', 'void SSL_free(SSL *s)\n{\n    int i;\n    if (s == NULL)\n        return;\n    CRYPTO_DOWN_REF(&s->references, &i, s->lock);\n    REF_PRINT_COUNT("SSL", s);\n    if (i > 0)\n        return;\n    REF_ASSERT_ISNT(i < 0);\n    X509_VERIFY_PARAM_free(s->param);\n    dane_final(&s->dane);\n    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_SSL, s, &s->ex_data);\n    ssl_free_wbio_buffer(s);\n    BIO_free_all(s->wbio);\n    BIO_free_all(s->rbio);\n    BUF_MEM_free(s->init_buf);\n    sk_SSL_CIPHER_free(s->cipher_list);\n    sk_SSL_CIPHER_free(s->cipher_list_by_id);\n    sk_SSL_CIPHER_free(s->tls13_ciphersuites);\n    if (s->session != NULL) {\n        ssl_clear_bad_session(s);\n        SSL_SESSION_free(s->session);\n    }\n    SSL_SESSION_free(s->psksession);\n    OPENSSL_free(s->psksession_id);\n    clear_ciphers(s);\n    ssl_cert_free(s->cert);\n    OPENSSL_free(s->ext.hostname);\n    SSL_CTX_free(s->session_ctx);\n#ifndef OPENSSL_NO_EC\n    OPENSSL_free(s->ext.ecpointformats);\n    OPENSSL_free(s->ext.supportedgroups);\n#endif\n    sk_X509_EXTENSION_pop_free(s->ext.ocsp.exts, X509_EXTENSION_free);\n#ifndef OPENSSL_NO_OCSP\n    sk_OCSP_RESPID_pop_free(s->ext.ocsp.ids, OCSP_RESPID_free);\n#endif\n#ifndef OPENSSL_NO_CT\n    SCT_LIST_free(s->scts);\n    OPENSSL_free(s->ext.scts);\n#endif\n    OPENSSL_free(s->ext.ocsp.resp);\n    OPENSSL_free(s->ext.alpn);\n    OPENSSL_free(s->ext.tls13_cookie);\n    OPENSSL_free(s->clienthello);\n    OPENSSL_free(s->pha_context);\n    EVP_MD_CTX_free(s->pha_dgst);\n    sk_X509_NAME_pop_free(s->ca_names, X509_NAME_free);\n    sk_X509_NAME_pop_free(s->client_ca_names, X509_NAME_free);\n    sk_X509_pop_free(s->verified_chain, X509_free);\n    if (s->method != NULL)\n        s->method->ssl_free(s);\n    RECORD_LAYER_release(&s->rlayer);\n    SSL_CTX_free(s->ctx);\n    ASYNC_WAIT_CTX_free(s->waitctx);\n#if !defined(OPENSSL_NO_NEXTPROTONEG)\n    OPENSSL_free(s->ext.npn);\n#endif\n#ifndef OPENSSL_NO_SRTP\n    sk_SRTP_PROTECTION_PROFILE_free(s->srtp_profiles);\n#endif\n    CRYPTO_THREAD_lock_free(s->lock);\n    OPENSSL_free(s);\n}', 'int ssl_clear_bad_session(SSL *s)\n{\n    if ((s->session != NULL) &&\n        !(s->shutdown & SSL_SENT_SHUTDOWN) &&\n        !(SSL_in_init(s) || SSL_in_before(s))) {\n        SSL_CTX_remove_session(s->session_ctx, s->session);\n        return 1;\n    } else\n        return 0;\n}', 'int SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c)\n{\n    return remove_session_lock(ctx, c, 1);\n}', 'static int remove_session_lock(SSL_CTX *ctx, SSL_SESSION *c, int lck)\n{\n    SSL_SESSION *r;\n    int ret = 0;\n    if ((c != NULL) && (c->session_id_length != 0)) {\n        if (lck)\n            CRYPTO_THREAD_write_lock(ctx->lock);\n        if ((r = lh_SSL_SESSION_retrieve(ctx->sessions, c)) != NULL) {\n            ret = 1;\n            r = lh_SSL_SESSION_delete(ctx->sessions, r);\n            SSL_SESSION_list_remove(ctx, r);\n        }\n        c->not_resumable = 1;\n        if (lck)\n            CRYPTO_THREAD_unlock(ctx->lock);\n        if (ctx->remove_session_cb != NULL)\n            ctx->remove_session_cb(ctx, c);\n        if (ret)\n            SSL_SESSION_free(r);\n    } else\n        ret = 0;\n    return ret;\n}', 'DEFINE_LHASH_OF(SSL_SESSION)', 'void *OPENSSL_LH_delete(OPENSSL_LHASH *lh, const void *data)\n{\n    unsigned long hash;\n    OPENSSL_LH_NODE *nn, **rn;\n    void *ret;\n    lh->error = 0;\n    rn = getrn(lh, data, &hash);\n    if (*rn == NULL) {\n        lh->num_no_delete++;\n        return NULL;\n    } else {\n        nn = *rn;\n        *rn = nn->next;\n        ret = nn->data;\n        OPENSSL_free(nn);\n        lh->num_delete++;\n    }\n    lh->num_items--;\n    if ((lh->num_nodes > MIN_NODES) &&\n        (lh->down_load >= (lh->num_items * LH_LOAD_MULT / lh->num_nodes)))\n        contract(lh);\n    return ret;\n}']