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Code Issues Releases Wiki Activity

4151. [bug] 'rndc flush' could cause a deadlock. [RT #39835]

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This commit is contained in:
Mark Andrews
2015-07-03 10:17:33 +10:00
parent 2bd63eca27
commit 307adf6792
2 changed files with 20 additions and 6 deletions
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2
CHANGES
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@@ -1,3 +1,5 @@
4151. [bug] 'rndc flush' could cause a deadlock. [RT #39835]
4150. [bug] win32: listen-on-v6 { any; }; was not working. Apply
minimal fix. [RT #39667]

24
lib/dns/cache.c
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@@ -1141,31 +1141,43 @@ cleaner_shutdown_action(isc_task_t *task, isc_event_t *event) {
isc_result_t
dns_cache_flush(dns_cache_t *cache) {
dns_db_t *db = NULL;
dns_db_t *db = NULL, *olddb;
dns_dbiterator_t *dbiterator = NULL, *olddbiterator = NULL;
isc_result_t result;
result = cache_create_db(cache, &db);
if (result != ISC_R_SUCCESS)
return (result);
result = dns_db_createiterator(db, ISC_FALSE, &dbiterator);
if (result != ISC_R_SUCCESS) {
dns_db_detach(&db);
return (result);
}
LOCK(&cache->lock);
LOCK(&cache->cleaner.lock);
if (cache->cleaner.state == cleaner_s_idle) {
if (cache->cleaner.iterator != NULL)
dns_dbiterator_destroy(&cache->cleaner.iterator);
(void) dns_db_createiterator(db, ISC_FALSE,
&cache->cleaner.iterator);
olddbiterator = cache->cleaner.iterator;
cache->cleaner.iterator = dbiterator;
dbiterator = NULL;
} else {
if (cache->cleaner.state == cleaner_s_busy)
cache->cleaner.state = cleaner_s_done;
cache->cleaner.replaceiterator = ISC_TRUE;
}
dns_db_detach(&cache->db);
olddb = cache->db;
cache->db = db;
dns_db_setcachestats(cache->db, cache->stats);
UNLOCK(&cache->cleaner.lock);
UNLOCK(&cache->lock);
if (dbiterator != NULL)
dns_dbiterator_destroy(&dbiterator);
if (olddbiterator != NULL)
dns_dbiterator_destroy(&olddbiterator);
dns_db_detach(&olddb);
return (ISC_R_SUCCESS);
}