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Code Issues Releases Wiki Activity

642. [bug] Break the exit_check() race in the zone module.

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[RT #598]
This commit is contained in:
Mark Andrews
2000-12-29 01:04:10 +00:00
parent 8e047d3b74
commit 253ab81bf2
2 changed files with 19 additions and 10 deletions
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3
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@@ -1,3 +1,6 @@
642. [bug] Break the exit_check() race in the zone module.
[RT #598]
641. [bug] $GENERATE caused a uninitialized link to be used.
[RT #595]

26
lib/dns/zone.c
View File

@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: zone.c,v 1.283 2000/12/28 01:29:06 marka Exp $ */
/* $Id: zone.c,v 1.284 2000/12/29 01:04:10 marka Exp $ */
#include <config.h>
@@ -1253,8 +1253,11 @@ zone_postload(dns_zone_t *zone, dns_db_t *db, isc_time_t loadtime,
return (result);
}
static void
static isc_boolean_t
exit_check(dns_zone_t *zone) {
REQUIRE(LOCKED_ZONE(zone));
if (DNS_ZONE_FLAG(zone, DNS_ZONEFLG_EXITING) &&
zone->irefs == 0)
{
@@ -1262,8 +1265,9 @@ exit_check(dns_zone_t *zone) {
* DNS_ZONEFLG_EXITING can only be set if erefs == 0.
*/
INSIST(zone->erefs == 0);
zone_free(zone);
return (ISC_TRUE);
}
return (ISC_FALSE);
}
static isc_result_t
@@ -1520,6 +1524,7 @@ zone_idetach(dns_zone_t **zonep) {
void
dns_zone_idetach(dns_zone_t **zonep) {
dns_zone_t *zone;
isc_boolean_t free_needed;
REQUIRE(zonep != NULL && DNS_ZONE_VALID(*zonep));
zone = *zonep;
@@ -1530,8 +1535,10 @@ dns_zone_idetach(dns_zone_t **zonep) {
zone->irefs--;
zone_log(zone, "dns_zone_idetach", ISC_LOG_DEBUG(10),
"eref = %d, irefs = %d", zone->erefs, zone->irefs);
free_needed = exit_check(zone);
UNLOCK_ZONE(zone);
exit_check(zone);
if (free_needed)
zone_free(zone);
}
isc_mem_t *
@@ -3562,6 +3569,7 @@ static void
zone_shutdown(isc_task_t *task, isc_event_t *event) {
dns_zone_t *zone = (dns_zone_t *) event->ev_arg;
isc_result_t result;
isc_boolean_t free_needed;
UNUSED(task);
REQUIRE(DNS_ZONE_VALID(zone));
@@ -3570,7 +3578,6 @@ zone_shutdown(isc_task_t *task, isc_event_t *event) {
zone_log(zone, "zone_shutdown", ISC_LOG_DEBUG(3), "shutting down");
LOCK_ZONE(zone);
DNS_ZONE_SETFLAG(zone, DNS_ZONEFLG_EXITING);
UNLOCK_ZONE(zone);
/*
* If we were waiting for xfrin quota, step out of
@@ -3587,18 +3594,14 @@ zone_shutdown(isc_task_t *task, isc_event_t *event) {
if (zone->xfr != NULL)
dns_xfrin_shutdown(zone->xfr);
LOCK_ZONE(zone);
if (zone->request != NULL) {
dns_request_cancel(zone->request);
}
UNLOCK_ZONE(zone);
if (zone->readio != NULL)
zonemgr_cancelio(zone->readio);
LOCK_ZONE(zone);
notify_cancel(zone);
UNLOCK_ZONE(zone);
if (zone->timer != NULL) {
result = isc_timer_reset(zone->timer, isc_timertype_inactive,
@@ -3609,7 +3612,10 @@ zone_shutdown(isc_task_t *task, isc_event_t *event) {
if (zone->view != NULL)
dns_view_weakdetach(&zone->view);
exit_check(zone);
free_needed = exit_check(zone);
UNLOCK_ZONE(zone);
if (free_needed)
zone_free(zone);
}
static void