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Code Issues Releases Wiki Activity

Ensure tree lock is always held when dns_rbt_fullnamefromnode is called

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This commit is contained in:
Mark Andrews
2020-05-19 16:19:26 +10:00
committed by Evan Hunt
parent db9d10e3c1
commit eded3efb79
1 changed files with 7 additions and 19 deletions
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26
lib/dns/rbtdb.c
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@@ -561,6 +561,8 @@ rdataset_addglue(dns_rdataset_t *rdataset, dns_dbversion_t *version,
dns_message_t *msg);
static void
free_gluetable(rbtdb_version_t *version);
static isc_result_t
nodefullname(dns_db_t *db, dns_dbnode_t *node, dns_name_t *name);
static dns_rdatasetmethods_t rdataset_methods = { rdataset_disassociate,
rdataset_first,
@@ -6665,9 +6667,7 @@ addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
}
name = dns_fixedname_initname(&fixed);
RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
dns_rbt_fullnamefromnode(rbtnode, name);
RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
nodefullname(db, node, name);
dns_rdataset_getownercase(rdataset, name);
newheader = (rdatasetheader_t *)region.base;
@@ -6865,8 +6865,6 @@ subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
REQUIRE(VALID_RBTDB(rbtdb));
REQUIRE(rbtversion != NULL && rbtversion->rbtdb == rbtdb);
dns_rbt_fullnamefromnode(rbtnode, nodename);
if (rbtdb->common.methods == &zone_methods) {
RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
REQUIRE(((rbtnode->nsec == DNS_RBT_NSEC_NSEC3 &&
@@ -6878,6 +6876,8 @@ subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
}
nodefullname(db, node, nodename);
result = dns_rdataslab_fromrdataset(rdataset, rbtdb->common.mctx,
&region, sizeof(rdatasetheader_t));
if (result != ISC_R_SUCCESS) {
@@ -7113,13 +7113,12 @@ deleterdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
newheader->last_used = 0;
newheader->node = rbtnode;
nodefullname(db, node, nodename);
NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
isc_rwlocktype_write);
dns_rbt_fullnamefromnode(rbtnode, nodename);
result = add32(rbtdb, rbtnode, nodename, rbtversion, newheader,
DNS_DBADD_FORCE, false, NULL, 0);
NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
isc_rwlocktype_write);
@@ -7228,12 +7227,6 @@ loading_addrdataset(void *arg, const dns_name_t *name,
REQUIRE(rdataset->rdclass == rbtdb->common.rdclass);
/*
* This routine does no node locking. See comments in
* 'load' below for more information on loading and
* locking.
*/
/*
* SOA records are only allowed at top of zone.
*/
@@ -7285,9 +7278,6 @@ loading_addrdataset(void *arg, const dns_name_t *name,
return (result);
}
if (result == ISC_R_SUCCESS) {
dns_name_t foundname;
dns_name_init(&foundname, NULL);
dns_rbt_namefromnode(node, &foundname);
node->locknum = node->hashval % rbtdb->node_lock_count;
}
@@ -7324,10 +7314,8 @@ loading_addrdataset(void *arg, const dns_name_t *name,
}
NODE_LOCK(&rbtdb->node_locks[node->locknum].lock, isc_rwlocktype_write);
result = add32(rbtdb, node, name, rbtdb->current_version, newheader,
DNS_DBADD_MERGE, true, NULL, 0);
NODE_UNLOCK(&rbtdb->node_locks[node->locknum].lock,
isc_rwlocktype_write);