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pass the nodename to add32() instead of calling dns_rbt_fullnamefromnode()

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in addition to being more efficient, this prevents a possible crash by
looking up the node name before the tree sructure can be changed when
cleaning up dead nodes in addrdataset().
This commit is contained in:
Evan Hunt
2020-05-18 18:09:08 -07:00
parent f027763d3a
commit db9d10e3c1
1 changed files with 21 additions and 20 deletions
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41
lib/dns/rbtdb.c
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@@ -5958,14 +5958,14 @@ update_recordsandxfrsize(bool add, rbtdb_version_t *rbtversion,
}
static isc_result_t
add32(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, rbtdb_version_t *rbtversion,
rdatasetheader_t *newheader, unsigned int options, bool loading,
dns_rdataset_t *addedrdataset, isc_stdtime_t now) {
add32(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, const dns_name_t *nodename,
rbtdb_version_t *rbtversion, rdatasetheader_t *newheader,
unsigned int options, bool loading, dns_rdataset_t *addedrdataset,
isc_stdtime_t now) {
rbtdb_changed_t *changed = NULL;
rdatasetheader_t *topheader, *topheader_prev, *header, *sigheader;
dns_fixedname_t fname;
dns_name_t *nodename = dns_fixedname_initname(&fname);
unsigned char *merged;
rdatasetheader_t *topheader = NULL, *topheader_prev = NULL;
rdatasetheader_t *header = NULL, *sigheader = NULL;
unsigned char *merged = NULL;
isc_result_t result;
bool header_nx;
bool newheader_nx;
@@ -5983,8 +5983,6 @@ add32(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, rbtdb_version_t *rbtversion,
* Caller must be holding the node lock.
*/
dns_rbt_fullnamefromnode(rbtnode, nodename);
if ((options & DNS_DBADD_MERGE) != 0) {
REQUIRE(rbtversion != NULL);
merge = true;
@@ -6668,7 +6666,7 @@ 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(node, name);
dns_rbt_fullnamefromnode(rbtnode, name);
RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
dns_rdataset_getownercase(rdataset, name);
@@ -6761,10 +6759,11 @@ addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
/*
* If we're adding a delegation type, adding to the auxiliary NSEC tree,
* or the DB is a cache in an overmem state, hold an exclusive lock on
* the tree. In the latter case the lock does not necessarily have to
* be acquired but it will help purge ancient entries more effectively.
* If we're adding a delegation type, adding to the auxiliary NSEC
* tree, or the DB is a cache in an overmem state, hold an
* exclusive lock on the tree. In the latter case the lock does
* not necessarily have to be acquired but it will help purge
* ancient entries more effectively.
*/
if (IS_CACHE(rbtdb) && isc_mem_isovermem(rbtdb->common.mctx)) {
cache_is_overmem = true;
@@ -6811,7 +6810,6 @@ addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
if (newnsec) {
dns_rbtnode_t *nsecnode;
dns_rbt_fullnamefromnode(rbtnode, name);
nsecnode = NULL;
result = dns_rbt_addnode(rbtdb->nsec, name, &nsecnode);
if (result == ISC_R_SUCCESS) {
@@ -6824,8 +6822,8 @@ addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
}
if (result == ISC_R_SUCCESS) {
result = add32(rbtdb, rbtnode, rbtversion, newheader, options,
false, addedrdataset, now);
result = add32(rbtdb, rbtnode, name, rbtversion, newheader,
options, false, addedrdataset, now);
}
if (result == ISC_R_SUCCESS && delegating) {
rbtnode->find_callback = 1;
@@ -7080,6 +7078,8 @@ deleterdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node;
rbtdb_version_t *rbtversion = version;
dns_fixedname_t fname;
dns_name_t *nodename = dns_fixedname_initname(&fname);
isc_result_t result;
rdatasetheader_t *newheader;
@@ -7116,8 +7116,9 @@ deleterdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
isc_rwlocktype_write);
result = add32(rbtdb, rbtnode, rbtversion, newheader, DNS_DBADD_FORCE,
false, NULL, 0);
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);
@@ -7324,7 +7325,7 @@ loading_addrdataset(void *arg, const dns_name_t *name,
NODE_LOCK(&rbtdb->node_locks[node->locknum].lock, isc_rwlocktype_write);
result = add32(rbtdb, node, rbtdb->current_version, newheader,
result = add32(rbtdb, node, name, rbtdb->current_version, newheader,
DNS_DBADD_MERGE, true, NULL, 0);
NODE_UNLOCK(&rbtdb->node_locks[node->locknum].lock,