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In dbiterator_prev, dereference_iter_node was being called too soon

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dns_rbtnodechain_prev requires the current node to still be valid
which was not always the case after dereference_iter_node was called.
Move the call to dereference_iter_node to after the dns_rbtnodechain_prev
to preserve the node.

(cherry picked from commit b677d31fca)
This commit is contained in:
Mark Andrews 2025-12-05 14:25:02 +11:00 committed by Ondřej Surý
parent e1cb1be33d
commit 7708678482
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GPG key ID: 2820F37E873DEA41
1 changed files with 3 additions and 2 deletions
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5
lib/dns/rbtdb.c
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@ -9582,11 +9582,12 @@ dbiterator_prev(dns_dbiterator_t *iterator) {
resume_iteration(rbtdbiter);
}
dereference_iter_node(rbtdbiter);
name = dns_fixedname_name(&rbtdbiter->name);
origin = dns_fixedname_name(&rbtdbiter->origin);
result = dns_rbtnodechain_prev(rbtdbiter->current, name, origin);
dereference_iter_node(rbtdbiter);
if (rbtdbiter->current == &rbtdbiter->nsec3chain &&
(result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN))
{