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bind/SOURCES/bind-9.16-CVE-2023-2911-1.p...

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From e73ecbf039c3b2cd33dd2926691a8a346c9ca574 Mon Sep 17 00:00:00 2001
From: Matthijs Mekking <matthijs@isc.org>
Date: Tue, 2 Aug 2022 14:21:40 +0200
Subject: [PATCH 1/3] Don't enable serve-stale on duplicate queries
When checking if we should enable serve-stale, add an early out case
when the result is an error signalling a duplicate query or a query
that would be dropped.
(cherry picked from commit 059a4c2f4d9d3cff371842f43208d021509314fa)
(cherry picked from commit dd7dde5743715dc0dec2defbb92b1a8637977bf9)
---
lib/ns/query.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/lib/ns/query.c b/lib/ns/query.c
index 4f61374e2c..c169e22bf4 100644
--- a/lib/ns/query.c
+++ b/lib/ns/query.c
@@ -7205,6 +7205,14 @@ query_usestale(query_ctx_t *qctx, isc_result_t result) {
return (false);
}
+ if (result == DNS_R_DUPLICATE || result == DNS_R_DROP) {
+ /*
+ * Don't enable serve-stale if the result signals a duplicate
+ * query or query that is being dropped.
+ */
+ return (false);
+ }
+
qctx_clean(qctx);
qctx_freedata(qctx);
--
2.40.1