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Clear up dead-assignment warnings from scan-build

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This commit is contained in:
Nick Mathewson 2017-09-12 17:46:09 -04:00
parent db00f24d8b
commit f2f729e26b
18 changed files with 65 additions and 52 deletions
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20
src/common/compat.c
View File

@ -2235,35 +2235,33 @@ switch_id(const char *user, const unsigned flags)
int
tor_disable_debugger_attach(void)
{
int r, attempted;
r = -1;
attempted = 0;
int r = -1;
log_debug(LD_CONFIG,
"Attemping to disable debugger attachment to Tor for "
"unprivileged users.");
#if defined(__linux__) && defined(HAVE_SYS_PRCTL_H) && defined(HAVE_PRCTL)
#ifdef PR_SET_DUMPABLE
attempted = 1;
#define TRIED_TO_DISABLE
r = prctl(PR_SET_DUMPABLE, 0);
#endif
#endif
#if defined(__APPLE__) && defined(PT_DENY_ATTACH)
if (r < 0) {
attempted = 1;
#elif defined(__APPLE__) && defined(PT_DENY_ATTACH)
#define TRIED_TO_DISABLE
r = ptrace(PT_DENY_ATTACH, 0, 0, 0);
}
#endif
// XXX: TODO - Mac OS X has dtrace and this may be disabled.
// XXX: TODO - Windows probably has something similar
if (r == 0 && attempted) {
#ifdef TRIED_TO_DISABLE
if (r == 0) {
log_debug(LD_CONFIG,"Debugger attachment disabled for "
"unprivileged users.");
return 1;
} else if (attempted) {
} else {
log_warn(LD_CONFIG, "Unable to disable debugger attaching: %s",
strerror(errno));
}
#endif
#undef TRIED_TO_DISABLE
return r;
}

2
src/common/timers.c
View File

@ -191,7 +191,7 @@ timers_initialize(void)
if (BUG(global_timeouts))
return; // LCOV_EXCL_LINE
timeout_error_t err;
timeout_error_t err = 0;
global_timeouts = timeouts_open(0, &err);
if (!global_timeouts) {
// LCOV_EXCL_START -- this can only fail on malloc failure.

25
src/common/util.c
View File

@ -3610,7 +3610,7 @@ start_daemon(void)
} else { /* Child */
close(daemon_filedes[0]); /* we only write */
pid = setsid(); /* Detach from controlling terminal */
(void) setsid(); /* Detach from controlling terminal */
/*
* Fork one more time, so the parent (the session group leader) can exit.
* This means that we, as a non-session group leader, can never regain a
@ -4308,7 +4308,6 @@ tor_spawn_background(const char *const filename, const char **argv,
int stderr_pipe[2];
int stdin_pipe[2];
int fd, retval;
ssize_t nbytes;
process_handle_t *process_handle;
int status;
@ -4329,7 +4328,7 @@ tor_spawn_background(const char *const filename, const char **argv,
and we are not allowed to use unsafe functions between fork and exec */
error_message_length = strlen(error_message);
child_state = CHILD_STATE_PIPE;
// child_state = CHILD_STATE_PIPE;
/* Set up pipe for redirecting stdout, stderr, and stdin of child */
retval = pipe(stdout_pipe);
@ -4366,7 +4365,7 @@ tor_spawn_background(const char *const filename, const char **argv,
return status;
}
child_state = CHILD_STATE_MAXFD;
// child_state = CHILD_STATE_MAXFD;
#ifdef _SC_OPEN_MAX
if (-1 == max_fd) {
@ -4381,7 +4380,7 @@ tor_spawn_background(const char *const filename, const char **argv,
max_fd = DEFAULT_MAX_FD;
#endif
child_state = CHILD_STATE_FORK;
// child_state = CHILD_STATE_FORK;
pid = fork();
if (0 == pid) {
@ -4417,7 +4416,7 @@ tor_spawn_background(const char *const filename, const char **argv,
if (-1 == retval)
goto error;
child_state = CHILD_STATE_CLOSEFD;
// child_state = CHILD_STATE_CLOSEFD;
close(stderr_pipe[0]);
close(stderr_pipe[1]);
@ -4433,7 +4432,7 @@ tor_spawn_background(const char *const filename, const char **argv,
close(fd);
}
child_state = CHILD_STATE_EXEC;
// child_state = CHILD_STATE_EXEC;
/* Call the requested program. We need the cast because
execvp doesn't define argv as const, even though it
@ -4452,7 +4451,8 @@ tor_spawn_background(const char *const filename, const char **argv,
error:
{
/* XXX: are we leaking fds from the pipe? */
int n;
int n, err=0;
ssize_t nbytes;
n = format_helper_exit_status(child_state, errno, hex_errno);
@ -4461,13 +4461,14 @@ tor_spawn_background(const char *const filename, const char **argv,
value, but there is nothing we can do if it fails */
/* TODO: Don't use STDOUT, use a pipe set up just for this purpose */
nbytes = write(STDOUT_FILENO, error_message, error_message_length);
err = (nbytes < 0);
nbytes = write(STDOUT_FILENO, hex_errno, n);
}
err += (nbytes < 0);
}
(void) nbytes;
_exit(err?254:255);
}
_exit(255);
/* Never reached, but avoids compiler warning */
return status; // LCOV_EXCL_LINE
}
@ -4534,7 +4535,7 @@ tor_spawn_background(const char *const filename, const char **argv,
}
*process_handle_out = process_handle;
return process_handle->status;
return status;
#endif // _WIN32
}

10
src/or/circuitmux.c
View File

@ -261,13 +261,11 @@ circuitmux_move_active_circ_to_tail(circuitmux_t *cmux, circuit_t *circ,
if (circ->n_mux == cmux) {
next_p = &(circ->next_active_on_n_chan);
prev_p = &(circ->prev_active_on_n_chan);
direction = CELL_DIRECTION_OUT;
} else {
or_circ = TO_OR_CIRCUIT(circ);
tor_assert(or_circ->p_mux == cmux);
next_p = &(or_circ->next_active_on_p_chan);
prev_p = &(or_circ->prev_active_on_p_chan);
direction = CELL_DIRECTION_IN;
}
}
tor_assert(next_p);
@ -1655,7 +1653,6 @@ circuitmux_assert_okay_pass_one(circuitmux_t *cmux)
circid_t circ_id;
circuit_t *circ;
or_circuit_t *or_circ;
unsigned int circ_is_active;
circuit_t **next_p, **prev_p;
unsigned int n_circuits, n_active_circuits, n_cells;
@ -1679,8 +1676,6 @@ circuitmux_assert_okay_pass_one(circuitmux_t *cmux)
tor_assert(chan);
circ = circuit_get_by_circid_channel_even_if_marked(circ_id, chan);
tor_assert(circ);
/* Clear the circ_is_active bit to start */
circ_is_active = 0;
/* Assert that we know which direction this is going */
tor_assert((*i)->muxinfo.direction == CELL_DIRECTION_OUT ||
@ -1707,7 +1702,7 @@ circuitmux_assert_okay_pass_one(circuitmux_t *cmux)
* Should this circuit be active? I.e., does the mux know about > 0
* cells on it?
*/
circ_is_active = ((*i)->muxinfo.cell_count > 0);
const int circ_is_active = ((*i)->muxinfo.cell_count > 0);
/* It should be in the linked list iff it's active */
if (circ_is_active) {
@ -1759,7 +1754,6 @@ circuitmux_assert_okay_pass_two(circuitmux_t *cmux)
circuit_t **next_p, **prev_p;
channel_t *chan;
unsigned int n_active_circuits = 0;
cell_direction_t direction;
chanid_circid_muxinfo_t search, *hashent = NULL;
tor_assert(cmux);
@ -1778,7 +1772,7 @@ circuitmux_assert_okay_pass_two(circuitmux_t *cmux)
curr_or_circ = NULL;
next_circ = NULL;
next_p = prev_p = NULL;
direction = 0;
cell_direction_t direction;
/* Figure out if this is n_mux or p_mux */
if (cmux == curr_circ->n_mux) {

10
src/or/connection.c
View File

@ -3062,9 +3062,11 @@ connection_buckets_decrement(connection_t *conn, time_t now,
(unsigned long)num_read, (unsigned long)num_written,
conn_type_to_string(conn->type),
conn_state_to_string(conn->type, conn->state));
if (num_written >= INT_MAX) num_written = 1;
if (num_read >= INT_MAX) num_read = 1;
tor_fragile_assert();
tor_assert_nonfatal_unreached();
if (num_written >= INT_MAX)
num_written = 1;
if (num_read >= INT_MAX)
num_read = 1;
}
record_num_bytes_transferred_impl(conn, now, num_read, num_written);
@ -3593,10 +3595,8 @@ connection_buf_read_from_socket(connection_t *conn, ssize_t *max_to_read,
connection_start_reading(conn);
}
/* we're already reading, one hopes */
result = 0;
break;
case TOR_TLS_DONE: /* no data read, so nothing to process */
result = 0;
break; /* so we call bucket_decrement below */
default:
break;

4
src/or/dirvote.c
View File

@ -541,8 +541,8 @@ compute_routerstatus_consensus(smartlist_t *votes, int consensus_method,
if (cur_n > most_n ||
(cur && cur_n == most_n && cur->status.published_on > most_published)) {
most = cur;
most_n = cur_n;
most_published = cur->status.published_on;
// most_n = cur_n; // unused after this point.
// most_published = cur->status.published_on; // unused after this point.
}
tor_assert(most);

6
src/or/rendservice.c
View File

@ -696,7 +696,6 @@ rend_config_service(const config_line_t *line_,
* of authorized clients. */
smartlist_t *type_names_split, *clients;
const char *authname;
int num_clients;
if (service->auth_type != REND_NO_AUTH) {
log_warn(LD_CONFIG, "Got multiple HiddenServiceAuthorizeClient "
"lines for a single service.");
@ -740,14 +739,15 @@ rend_config_service(const config_line_t *line_,
SMARTLIST_FOREACH(type_names_split, char *, cp, tor_free(cp));
smartlist_free(type_names_split);
/* Remove duplicate client names. */
num_clients = smartlist_len(clients);
{
int num_clients = smartlist_len(clients);
smartlist_sort_strings(clients);
smartlist_uniq_strings(clients);
if (smartlist_len(clients) < num_clients) {
log_info(LD_CONFIG, "HiddenServiceAuthorizeClient contains %d "
"duplicate client name(s); removing.",
num_clients - smartlist_len(clients));
num_clients = smartlist_len(clients);
}
}
SMARTLIST_FOREACH_BEGIN(clients, const char *, client_name)
{

2
src/or/statefile.c
View File

@ -659,8 +659,6 @@ save_transport_to_state(const char *transport,
*next = line = tor_malloc_zero(sizeof(config_line_t));
line->key = tor_strdup("TransportProxy");
tor_asprintf(&line->value, "%s %s", transport, fmt_addrport(addr, port));
next = &(line->next);
}
if (!get_options()->AvoidDiskWrites)

2
src/test/test_addr.c
View File

@ -760,7 +760,9 @@ test_addr_ip6_helpers(void *arg)
/* get interface addresses */
r = get_interface_address6(LOG_DEBUG, AF_INET, &t1);
tt_int_op(r, OP_LE, 0); // "it worked or it didn't"
i = get_interface_address6(LOG_DEBUG, AF_INET6, &t2);
tt_int_op(i, OP_LE, 0); // "it worked or it didn't"
TT_BLATHER(("v4 address: %s (family=%d)", fmt_addr(&t1),
tor_addr_family(&t1)));

1
src/test/test_config.c
View File

@ -704,6 +704,7 @@ test_config_parse_transport_plugin_line(void *arg)
tt_int_op(r, OP_LT, 0);
r = parse_transport_line(options,
"transport_1,transport_2 proxy 1.2.3.4:567", 1, 1);
tt_int_op(r, OP_LT, 0);
/* No port error exit */
r = parse_transport_line(options,
"transport_1 socks5 1.2.3.4", 1, 0);

1
src/test/test_crypto.c
View File

@ -1406,6 +1406,7 @@ test_crypto_digests(void *arg)
AUTHORITY_SIGNKEY_A_DIGEST, HEX_DIGEST_LEN);
r = crypto_pk_get_common_digests(k, &pkey_digests);
tt_int_op(r, OP_EQ, 0);
tt_mem_op(hex_str(pkey_digests.d[DIGEST_SHA1], DIGEST_LEN),OP_EQ,
AUTHORITY_SIGNKEY_A_DIGEST, HEX_DIGEST_LEN);

4
src/test/test_dir.c
View File

@ -2252,6 +2252,7 @@ test_dir_networkstatus_compute_bw_weights_v10(void *arg)
tt_i64_op(G+M+E+D, OP_EQ, T);
ret = networkstatus_compute_bw_weights_v10(chunks, G, M, E, D, T,
weight_scale);
tt_assert(ret);
tt_str_op(smartlist_get(chunks, 0), OP_EQ, "bandwidth-weights Wbd=883 Wbe=0 "
"Wbg=3673 Wbm=10000 Wdb=10000 Web=10000 Wed=8233 Wee=10000 Weg=8233 "
"Wem=10000 Wgb=10000 Wgd=883 Wgg=6327 Wgm=6327 Wmb=10000 Wmd=883 Wme=0 "
@ -2268,6 +2269,7 @@ test_dir_networkstatus_compute_bw_weights_v10(void *arg)
tt_i64_op(G+M+E+D, OP_EQ, T);
ret = networkstatus_compute_bw_weights_v10(chunks, G, M, E, D, T,
weight_scale);
tt_assert(ret);
tt_str_op(smartlist_get(chunks, 0), OP_EQ, "bandwidth-weights Wbd=0 Wbe=0 "
"Wbg=4194 Wbm=10000 Wdb=10000 Web=10000 Wed=10000 Wee=10000 Weg=10000 "
"Wem=10000 Wgb=10000 Wgd=0 Wgg=5806 Wgm=5806 Wmb=10000 Wmd=0 Wme=0 "
@ -2284,6 +2286,7 @@ test_dir_networkstatus_compute_bw_weights_v10(void *arg)
tt_i64_op(G+M+E+D, OP_EQ, T);
ret = networkstatus_compute_bw_weights_v10(chunks, G, M, E, D, T,
weight_scale);
tt_assert(ret);
tt_str_op(smartlist_get(chunks, 0), OP_EQ, "bandwidth-weights Wbd=317 "
"Wbe=5938 Wbg=0 Wbm=10000 Wdb=10000 Web=10000 Wed=9366 Wee=4061 "
"Weg=9366 Wem=4061 Wgb=10000 Wgd=317 Wgg=10000 Wgm=10000 Wmb=10000 "
@ -2304,6 +2307,7 @@ test_dir_networkstatus_compute_bw_weights_v10(void *arg)
"Wbe=0 Wbg=0 Wbm=10000 Wdb=10000 Web=10000 Wed=3333 Wee=10000 Weg=3333 "
"Wem=10000 Wgb=10000 Wgd=3333 Wgg=10000 Wgm=10000 Wmb=10000 Wmd=3333 "
"Wme=0 Wmg=0 Wmm=10000\n");
tt_assert(ret);
done:
SMARTLIST_FOREACH(chunks, char *, cp, tor_free(cp));

3
src/test/test_hs_common.c
View File

@ -708,6 +708,7 @@ test_hid_serv_request_tracker(void *arg)
/* Add another request with very short key */
retval = hs_lookup_last_hid_serv_request(hsdir, "l", now, 1);
tt_int_op(retval, OP_EQ, now);
tt_int_op(strmap_size(request_tracker),OP_EQ, 3);
/* Try deleting entries with a dummy key. Check that our previous requests
@ -1511,7 +1512,7 @@ helper_test_hsdir_sync(networkstatus_t *ns,
tt_int_op(smartlist_len(desc->previous_hsdirs), OP_EQ, 6);
/* 3) Initialize client time */
now = helper_set_consensus_and_system_time(ns, client_between_srv_and_tp);
helper_set_consensus_and_system_time(ns, client_between_srv_and_tp);
cleanup_nodelist();
SMARTLIST_FOREACH(ns->routerstatus_list,

2
src/test/test_hs_service.c
View File

@ -1269,6 +1269,7 @@ test_upload_descriptors(void *arg)
ret = parse_rfc1123_time("Sat, 26 Oct 1985 13:00:00 UTC",
&mock_ns.valid_after);
tt_int_op(ret, OP_EQ, 0);
ret = parse_rfc1123_time("Sat, 26 Oct 1985 14:00:00 UTC",
&mock_ns.fresh_until);
tt_int_op(ret, OP_EQ, 0);
@ -1344,6 +1345,7 @@ test_revision_counter_state(void *arg)
&desc_two->blinded_kp.pubkey,
&service_found);
tt_int_op(service_found, OP_EQ, 0);
tt_u64_op(cached_rev_counter, OP_EQ, 0);
/* Now let's try with the right pubkeys */
cached_rev_counter =check_state_line_for_service_rev_counter(state_line_one,

6
src/test/test_options.c
View File

@ -659,6 +659,7 @@ test_options_validate__logs(void *ignored)
tt_str_op(tdata->opt->Logs->key, OP_EQ, "Log");
tt_str_op(tdata->opt->Logs->value, OP_EQ, "notice stdout");
tor_free(msg);
tt_int_op(ret, OP_EQ, -1);
free_options_test_data(tdata);
tdata = get_options_test_data("");
@ -669,6 +670,7 @@ test_options_validate__logs(void *ignored)
tt_str_op(tdata->opt->Logs->key, OP_EQ, "Log");
tt_str_op(tdata->opt->Logs->value, OP_EQ, "warn stdout");
tor_free(msg);
tt_int_op(ret, OP_EQ, -1);
free_options_test_data(tdata);
tdata = get_options_test_data("");
@ -678,6 +680,7 @@ test_options_validate__logs(void *ignored)
ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg);
tt_assert(!tdata->opt->Logs);
tor_free(msg);
tt_int_op(ret, OP_EQ, -1);
free_options_test_data(tdata);
tdata = get_options_test_data("");
@ -686,6 +689,7 @@ test_options_validate__logs(void *ignored)
ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 1, &msg);
tt_assert(!tdata->opt->Logs);
tor_free(msg);
tt_int_op(ret, OP_EQ, -1);
free_options_test_data(tdata);
tdata = get_options_test_data("");
@ -694,6 +698,7 @@ test_options_validate__logs(void *ignored)
ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg);
tt_assert(!tdata->opt->Logs);
tor_free(msg);
tt_int_op(ret, OP_EQ, -1);
free_options_test_data(tdata);
tdata = get_options_test_data("");
@ -703,6 +708,7 @@ test_options_validate__logs(void *ignored)
tdata->opt->Logs = cl;
ret = options_validate(tdata->old_opt, tdata->opt, tdata->def_opt, 0, &msg);
tt_int_op((intptr_t)tdata->opt->Logs, OP_EQ, (intptr_t)cl);
tt_int_op(ret, OP_EQ, -1);
done:
quiet_level = orig_quiet_level;

1
src/test/test_rendcache.c
View File

@ -58,6 +58,7 @@ test_rend_cache_lookup_entry(void *data)
tt_int_op(ret, OP_EQ, 0);
ret = rend_cache_lookup_entry(service_id, 2, &entry);
tt_int_op(ret, OP_EQ, 0);
tt_assert(entry);
tt_int_op(entry->len, OP_EQ, strlen(desc_holder->desc_str));
tt_str_op(entry->desc, OP_EQ, desc_holder->desc_str);

1
src/test/test_tortls.c
View File

@ -1378,6 +1378,7 @@ test_tortls_evaluate_ecgroup_for_tls(void *ignored)
ret = evaluate_ecgroup_for_tls("P224");
// tt_int_op(ret, OP_EQ, 1); This varies between machines
tt_assert(ret == 0 || ret == 1);
done:
(void)0;

3
src/test/test_util.c
View File

@ -2179,10 +2179,13 @@ test_util_parse_integer(void *arg)
tt_int_op(1,OP_EQ, i);
tt_assert(DBL_TO_U64(d) == 0);
d = tor_parse_double(" ", 0, (double)UINT64_MAX,&i,NULL);
tt_double_op(fabs(d), OP_LT, 1e-10);
tt_int_op(0,OP_EQ, i);
d = tor_parse_double(".0a", 0, (double)UINT64_MAX,&i,NULL);
tt_double_op(fabs(d), OP_LT, 1e-10);
tt_int_op(0,OP_EQ, i);
d = tor_parse_double(".0a", 0, (double)UINT64_MAX,&i,&cp);
tt_double_op(fabs(d), OP_LT, 1e-10);
tt_int_op(1,OP_EQ, i);
d = tor_parse_double("-.0", 0, (double)UINT64_MAX,&i,NULL);
tt_int_op(1,OP_EQ, i);