From 08f1cba096243cd14041731b7ea1ad45e54e87b0 Mon Sep 17 00:00:00 2001
From: Mark Andrews <marka@isc.org>
Date: Wed, 24 Nov 2021 11:03:19 +1100
Subject: [PATCH] Do not convert ISC_R_NOSPACE to DNS_R_SERVFAIL too early

The parsing loop needs to process ISC_R_NOSPACE to properly
size the buffer.  If result is still ISC_R_NOSPACE at the end
of the parsing loop set result to DNS_R_SERVFAIL.
---
 lib/dns/sdlz.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/dns/sdlz.c b/lib/dns/sdlz.c
index 5476ef391f..5eea5cb6b9 100644
--- a/lib/dns/sdlz.c
+++ b/lib/dns/sdlz.c
@@ -1852,7 +1852,6 @@ dns_sdlz_putrr(dns_sdlzlookup_t *lookup, const char *type, dns_ttl_t ttl,
 					    mctx, rdatabuf, &lookup->callbacks);
 		if (result != ISC_R_SUCCESS) {
 			isc_buffer_free(&rdatabuf);
-			result = DNS_R_SERVFAIL;
 		}
 		if (size >= 65535) {
 			break;
@@ -1864,6 +1863,7 @@ dns_sdlz_putrr(dns_sdlzlookup_t *lookup, const char *type, dns_ttl_t ttl,
 	} while (result == ISC_R_NOSPACE);
 
 	if (result != ISC_R_SUCCESS) {
+		result = DNS_R_SERVFAIL;
 		goto failure;
 	}