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named crashes on shutdown after load rpz failed

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This may happen when loading an RPZ failed and the code path skips
calling dns_db_endload().  The dns_rpz_zone_t object is still kept
marked as having registered db.  So when this object is finally
destroyed in rpz_detach(), this code will incorrectly call
`dns_db_updatenotify_unregister()`:

   if (rpz->db_registered)
     dns_db_updatenotify_unregister(rpz->db,
                                    dns_rpz_dbupdate_callback, rpz);

and trigger this assertion failure:

   REQUIRE(db != NULL);

To fix this, only call `dns_db_updatenotify_unregister()` when
`rpz->db` is not NULL.
This commit is contained in:
Matthijs Mekking 2019-02-07 15:25:28 +01:00 committed by Matthijs Mekking
parent 8d392f9093
commit a490c09121
2 changed files with 5 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
lib/dns/rpz.c
View File

@ -1586,7 +1586,6 @@ dns_rpz_dbupdate_callback(dns_db_t *db, void *fn_arg) {
LOCK(&zone->rpzs->maint_lock);
REQUIRE(zone->db_registered);
/* New zone came as AXFR */
if (zone->db != NULL && zone->db != db) {
/* We need to clean up the old DB */
@ -2097,14 +2096,14 @@ rpz_detach(dns_rpz_zone_t **rpzp, dns_rpz_zones_t *rpzs) {
if (dns_name_dynamic(&rpz->cname)) {
dns_name_free(&rpz->cname, rpzs->mctx);
}
if (rpz->db_registered) {
dns_db_updatenotify_unregister(rpz->db,
dns_rpz_dbupdate_callback, rpz);
}
if (rpz->dbversion != NULL) {
dns_db_closeversion(rpz->db, &rpz->dbversion, false);
}
if (rpz->db != NULL) {
if (rpz->db_registered) {
dns_db_updatenotify_unregister(
rpz->db, dns_rpz_dbupdate_callback, rpz);
}
dns_db_detach(&rpz->db);
}
if (rpz->updaterunning) {

2
lib/dns/zone.c
View File

@ -2120,7 +2120,7 @@ zone_load(dns_zone_t *zone, unsigned int flags, bool locked) {
}
}
if (! dns_db_ispersistent(db)) {
if (!dns_db_ispersistent(db)) {
if (zone->masterfile != NULL) {
result = zone_startload(db, zone, loadtime);
} else {