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Fix memory leak in rend_cache_store_v2_desc_as_client(), and refactor the function to use the "goto err" idiom.

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svn:r17665
This commit is contained in:
Nick Mathewson 2008-12-18 00:11:49 +00:00
parent 1510d50fab
commit 5c235cb5ec
2 changed files with 27 additions and 20 deletions
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3
ChangeLog
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@ -70,6 +70,9 @@ Changes in version 0.2.1.9-alpha - 2008-12-2?
0.0.6pre1; also, do not stall hidden services because of
introduction points thrown away; bugfix on 0.2.1.7-alpha. Spotted
by John Brooks. Patch by Karsten. Fixes bug 874.
- Fix a memory leak when we decline to add a v2 rendezvous descriptor to
the cache because we already had a v0 descriptor with the same ID.
Bugfix on 0.2.0.18-alpha.
o Deprecated and removed features:
- RedirectExits has been removed. It was deprecated since 0.2.0.3-alpha.

44
src/or/rendcommon.c
View File

@ -1273,29 +1273,28 @@ rend_cache_store_v2_desc_as_client(const char *desc,
char key[REND_SERVICE_ID_LEN_BASE32+2];
char service_id[REND_SERVICE_ID_LEN_BASE32+1];
rend_cache_entry_t *e;
int retval;
tor_assert(rend_cache);
tor_assert(desc);
/* Parse the descriptor. */
if (rend_parse_v2_service_descriptor(&parsed, desc_id, &intro_content,
&intro_size, &encoded_size,
&next_desc, desc) < 0) {
if (parsed) rend_service_descriptor_free(parsed);
tor_free(intro_content);
log_warn(LD_REND, "Could not parse descriptor.");
return -2;
retval = -2;
goto err;
}
/* Compute service ID from public key. */
if (rend_get_service_id(parsed->pk, service_id)<0) {
log_warn(LD_REND, "Couldn't compute service ID.");
rend_service_descriptor_free(parsed);
tor_free(intro_content);
return -2;
retval = -2;
goto err;
}
/* Decode/decrypt introduction points. */
if (intro_content) {
if (rend_query->auth_type != REND_NO_AUTH &&
rend_query->descriptor_cookie) {
char *ipos_decrypted;
char *ipos_decrypted = NULL;
size_t ipos_decrypted_size;
if (rend_decrypt_introduction_points(&ipos_decrypted,
&ipos_decrypted_size,
@ -1317,10 +1316,8 @@ rend_cache_store_v2_desc_as_client(const char *desc,
log_warn(LD_REND, "Failed to parse introduction points. Either the "
"service has published a corrupt descriptor or you have "
"provided invalid authorization data.");
if (parsed)
rend_service_descriptor_free(parsed);
tor_free(intro_content);
return -2;
retval = -2;
goto err;
}
} else {
log_info(LD_REND, "Descriptor does not contain any introduction points.");
@ -1332,22 +1329,23 @@ rend_cache_store_v2_desc_as_client(const char *desc,
if (parsed->timestamp < now - REND_CACHE_MAX_AGE-REND_CACHE_MAX_SKEW) {
log_warn(LD_REND, "Service descriptor with service ID %s is too old.",
safe_str(service_id));
rend_service_descriptor_free(parsed);
return -2;
retval = -2;
goto err;
}
/* Is descriptor too far in the future? */
if (parsed->timestamp > now + REND_CACHE_MAX_SKEW) {
log_warn(LD_REND, "Service descriptor with service ID %s is too far in "
"the future.", safe_str(service_id));
rend_service_descriptor_free(parsed);
return -2;
retval = -2;
goto err;
}
/* Do we have a v0 descriptor? */
tor_snprintf(key, sizeof(key), "0%s", service_id);
if (strmap_get_lc(rend_cache, key)) {
log_info(LD_REND, "We already have a v0 descriptor for service ID %s.",
safe_str(service_id));
return -1;
retval = -1;
goto err;
}
/* Do we already have a newer descriptor? */
tor_snprintf(key, sizeof(key), "2%s", service_id);
@ -1356,16 +1354,16 @@ rend_cache_store_v2_desc_as_client(const char *desc,
log_info(LD_REND, "We already have a newer service descriptor for "
"service ID %s with the same desc ID and version.",
safe_str(service_id));
rend_service_descriptor_free(parsed);
return 0;
retval = 0;
goto err;
}
/* Do we already have this descriptor? */
if (e && !strcmp(desc, e->desc)) {
log_info(LD_REND,"We already have this service descriptor %s.",
safe_str(service_id));
e->received = time(NULL);
rend_service_descriptor_free(parsed);
return 0;
retval = 0;
goto err;
}
if (!e) {
e = tor_malloc_zero(sizeof(rend_cache_entry_t));
@ -1382,6 +1380,12 @@ rend_cache_store_v2_desc_as_client(const char *desc,
log_debug(LD_REND,"Successfully stored rend desc '%s', len %d.",
safe_str(service_id), (int)encoded_size);
return 1;
err:
if (parsed)
rend_service_descriptor_free(parsed);
tor_free(intro_content);
return retval;
}
/** Called when we get a rendezvous-related relay cell on circuit