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From 6c26ede8edcb700caca12c501c6c129801989526 Mon Sep 17 00:00:00 2001
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From: Mark Andrews <marka@isc.org>
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Date: Fri, 23 Feb 2024 10:12:47 +1100
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Subject: [PATCH] Do not use header_prev in expire_lru_headers
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dns__cacherbt_expireheader can unlink / free header_prev underneath
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it. Use ISC_LIST_TAIL after calling dns__cacherbt_expireheader
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instead to get the next pointer to be processed.
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(cherry picked from commit 7ce2e86024f022decb2678963538515ca39ab4ab)
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(cherry picked from commit f88f21b7d890eb80097f4bd434fedb29c2f9ff63)
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---
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lib/dns/rbtdb.c | 8 ++++----
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1 file changed, 4 insertions(+), 4 deletions(-)
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diff --git a/lib/dns/rbtdb.c b/lib/dns/rbtdb.c
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index e61cb21..4171039 100644
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--- a/lib/dns/rbtdb.c
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+++ b/lib/dns/rbtdb.c
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@@ -10358,19 +10358,19 @@ update_header(dns_rbtdb_t *rbtdb, rdatasetheader_t *header,
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static size_t
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expire_lru_headers(dns_rbtdb_t *rbtdb, unsigned int locknum, size_t purgesize,
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isc_boolean_t tree_locked) {
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- rdatasetheader_t *header, *header_prev;
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+ rdatasetheader_t *header;
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size_t purged = 0;
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for (header = ISC_LIST_TAIL(rbtdb->rdatasets[locknum]);
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- header != NULL && purged <= purgesize; header = header_prev)
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+ header != NULL && purged <= purgesize;
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+ header = ISC_LIST_TAIL(rbtdb->rdatasets[locknum]))
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{
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- header_prev = ISC_LIST_PREV(header, link);
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/*
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* Unlink the entry at this point to avoid checking it
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* again even if it's currently used someone else and
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* cannot be purged at this moment. This entry won't be
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* referenced any more (so unlinking is safe) since the
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- * TTL was reset to 0.
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+ * TTL will be reset to 0.
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*/
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ISC_LIST_UNLINK(rbtdb->rdatasets[locknum], header, link);
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size_t header_size = rdataset_size(header);
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--
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2.44.0
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