mir/bind
2
0
Fork 0
mirror of https://gitlab.isc.org/isc-projects/bind9 synced 2025-08-31 06:25:31 +00:00
Code Issues Releases Wiki Activity

rbtdb: cleanup_dead_nodes should ignore alive nodes on the deadlist

Browse Source
This commit is contained in:
Witold Kręcicki
2020-06-30 14:24:12 +02:00
committed by Ondřej Surý
parent dbd03ce112
commit c8f2d55acf
1 changed files with 9 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
lib/dns/rbtdb.c
View File

@@ -1914,15 +1914,16 @@ cleanup_dead_nodes(dns_rbtdb_t *rbtdb, int bucketnum) {
ISC_LIST_UNLINK(rbtdb->deadnodes[bucketnum], node, deadlink);
/*
* Since we're holding a tree write lock, it should be
* impossible for this node to be referenced by others.
*
* decrement_reference may not have tested node->down, as
* the tree_lock was not held, before adding the node to
* deadnodes so we test it here.
* We might have reactivated this node without a tree write
* lock, so we couldn't remove this node from deadnodes then
* and we have to do it now.
*/
INSIST(isc_refcount_current(&node->references) == 0 &&
node->data == NULL);
if (isc_refcount_current(&node->references) != 0 ||
node->data != NULL) {
node = ISC_LIST_HEAD(rbtdb->deadnodes[bucketnum]);
count--;
continue;
}
if (is_leaf(node) && rbtdb->task != NULL) {
send_to_prune_tree(rbtdb, node, isc_rwlocktype_write);