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Code Issues Releases Wiki Activity

2238. [bug] It was possible to trigger a REQUIRE when a

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validation was cancelled. [RT #17106]
This commit is contained in:
Mark Andrews
2007-09-14 05:43:05 +00:00
parent a7b7a4ebc3
commit e2c3f8059e
3 changed files with 51 additions and 18 deletions
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37
lib/dns/resolver.c
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@@ -15,7 +15,7 @@
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: resolver.c,v 1.351 2007/09/06 10:00:19 marka Exp $ */
/* $Id: resolver.c,v 1.352 2007/09/14 05:43:05 marka Exp $ */
/*! \file */
@@ -195,6 +195,7 @@ struct fetchctx {
isc_sockaddrlist_t bad;
isc_sockaddrlist_t edns;
isc_sockaddrlist_t edns512;
dns_validator_t *validator;
ISC_LIST(dns_validator_t) validators;
dns_db_t * cache;
dns_adb_t * adb;
@@ -426,9 +427,13 @@ valcreate(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo, dns_name_t *name,
sigrdataset, fctx->rmessage,
valoptions, task, validated, valarg,
&validator);
if (result == ISC_R_SUCCESS)
if (result == ISC_R_SUCCESS) {
if ((valoptions & DNS_VALIDATOR_DEFER) == 0) {
INSIST(fctx->validator == NULL);
fctx->validator = validator;
}
ISC_LIST_APPEND(fctx->validators, validator, link);
else
} else
isc_mem_put(fctx->res->buckets[fctx->bucketnum].mctx,
valarg, sizeof(*valarg));
return (result);
@@ -3040,6 +3045,7 @@ fctx_create(dns_resolver_t *res, dns_name_t *name, dns_rdatatype_t type,
ISC_LIST_INIT(fctx->edns);
ISC_LIST_INIT(fctx->edns512);
ISC_LIST_INIT(fctx->validators);
fctx->validator = NULL;
fctx->find = NULL;
fctx->altfind = NULL;
fctx->pending = 0;
@@ -3378,7 +3384,7 @@ maybe_destroy(fetchctx_t *fctx) {
unsigned int bucketnum;
isc_boolean_t bucket_empty = ISC_FALSE;
dns_resolver_t *res = fctx->res;
dns_validator_t *validator;
dns_validator_t *validator, *next_validator;
REQUIRE(SHUTTINGDOWN(fctx));
@@ -3386,16 +3392,22 @@ maybe_destroy(fetchctx_t *fctx) {
return;
for (validator = ISC_LIST_HEAD(fctx->validators);
validator != NULL;
validator = ISC_LIST_HEAD(fctx->validators)) {
ISC_LIST_UNLINK(fctx->validators, validator, link);
validator != NULL; validator = next_validator) {
next_validator = ISC_LIST_NEXT(validator, link);
dns_validator_cancel(validator);
/*
* If this is a active validator wait for the cancel
* to complete before calling dns_validator_destroy().
*/
if (validator == fctx->validator)
continue;
ISC_LIST_UNLINK(fctx->validators, validator, link);
dns_validator_destroy(&validator);
}
bucketnum = fctx->bucketnum;
LOCK(&res->buckets[bucketnum].lock);
if (fctx->references == 0)
if (fctx->references == 0 && ISC_LIST_EMPTY(fctx->validators))
bucket_empty = fctx_destroy(fctx);
UNLOCK(&res->buckets[bucketnum].lock);
@@ -3442,6 +3454,7 @@ validated(isc_task_t *task, isc_event_t *event) {
FCTXTRACE("received validation completion event");
ISC_LIST_UNLINK(fctx->validators, vevent->validator, link);
fctx->validator = NULL;
/*
* Destroy the validator early so that we can
@@ -3527,9 +3540,11 @@ validated(isc_task_t *task, isc_event_t *event) {
add_bad(fctx, addrinfo, result);
isc_event_free(&event);
UNLOCK(&fctx->res->buckets[fctx->bucketnum].lock);
if (!ISC_LIST_EMPTY(fctx->validators))
dns_validator_send(ISC_LIST_HEAD(fctx->validators));
else if (sentresponse)
INSIST(fctx->validator == NULL);
fctx->validator = ISC_LIST_HEAD(fctx->validators);
if (fctx->validator != NULL) {
dns_validator_send(fctx->validator);
} else if (sentresponse)
fctx_done(fctx, result); /* Locks bucket. */
else
fctx_try(fctx); /* Locks bucket. */