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bind/SOURCES/bind-9.16-CVE-2023-2911-3.p...

61 lines
2.0 KiB

From c20e9d30bae58d3120aa7c6a0e5dcae0e7e93dbd Mon Sep 17 00:00:00 2001
From: Matthijs Mekking <matthijs@isc.org>
Date: Thu, 1 Jun 2023 10:03:48 +0200
Subject: [PATCH 3/3] Fix serve-stale hang at shutdown
The 'refresh_rrset' variable is used to determine if we can detach from
the client. This can cause a hang on shutdown. To fix this, move setting
of the 'nodetach' variable up to where 'refresh_rrset' is set (in
query_lookup(), and thus not in ns_query_done()), and set it to false
when actually refreshing the RRset, so that when this lookup is
completed, the client will be detached.
(cherry picked from commit c003c5bc3c68f3e513654b6689e1f60280d14844)
---
lib/ns/query.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/lib/ns/query.c b/lib/ns/query.c
index 1eb662ea4d..4fe3e30f45 100644
--- a/lib/ns/query.c
+++ b/lib/ns/query.c
@@ -5644,6 +5644,7 @@ query_refresh_rrset(query_ctx_t *orig_qctx) {
qctx.client->query.dboptions &= ~(DNS_DBFIND_STALETIMEOUT |
DNS_DBFIND_STALEOK |
DNS_DBFIND_STALEENABLED);
+ qctx.client->nodetach = false;
/*
* We'll need some resources...
@@ -5868,7 +5869,14 @@ query_lookup(query_ctx_t *qctx) {
"%s stale answer used, an attempt to "
"refresh the RRset will still be made",
namebuf);
+
qctx->refresh_rrset = STALE(qctx->rdataset);
+
+ /*
+ * If we are refreshing the RRSet, we must not
+ * detach from the client in query_send().
+ */
+ qctx->client->nodetach = qctx->refresh_rrset;
}
} else {
/*
@@ -11469,12 +11477,7 @@ ns_query_done(query_ctx_t *qctx) {
/*
* Client may have been detached after query_send(), so
* we test and store the flag state here, for safety.
- * If we are refreshing the RRSet, we must not detach from the client
- * in the query_send(), so we need to override the flag.
*/
- if (qctx->refresh_rrset) {
- qctx->client->nodetach = true;
- }
nodetach = qctx->client->nodetach;
query_send(qctx->client);
--
2.40.1