Update the vendor branch with a patch to this file that was

researched by glebius, and incorporated by ISC into the next
version of BIND. Unfortunately, it looks like their release
will come after the release of FreeBSD 6, so we will bring
this in now.

The patch addresses a problem with high-load resolvers which
hit memory barriers. Without this patch, running the resolving
name server out of memory would lead to "unpredictable results."

Of course, the canonical answer to this problem is to put more
memory into the system, however that is not always possible, and
the code should be able to handle this situation gracefully in
any case.

1 files changed, 4 insertions, 2 deletions

diff --git a/contrib/bind9/lib/dns/resolver.c b/contrib/bind9/lib/dns/resolver.c
index 90af5b0..790a2f4 100644
--- a/contrib/bind9/lib/dns/resolver.c
+++ b/contrib/bind9/lib/dns/resolver.c
@@ -2665,7 +2665,7 @@ fctx_create(dns_resolver_t *res, dns_name_t *name, dns_rdatatype_t type,
 	    unsigned int options, unsigned int bucketnum, fetchctx_t **fctxp)
 {
 	fetchctx_t *fctx;
-	isc_result_t result = ISC_R_SUCCESS;
+	isc_result_t result;
 	isc_result_t iresult;
 	isc_interval_t interval;
 	dns_fixedname_t qdomain;
@@ -2687,8 +2687,10 @@ fctx_create(dns_resolver_t *res, dns_name_t *name, dns_rdatatype_t type,
 	strcat(buf, "/");	/* checked */
 	strcat(buf, typebuf);	/* checked */
 	fctx->info = isc_mem_strdup(res->mctx, buf);
-	if (fctx->info == NULL)
+	if (fctx->info == NULL) {
+		result = ISC_R_NOMEMORY;
 		goto cleanup_fetch;
+	}
 	FCTXTRACE("create");
 	dns_name_init(&fctx->name, NULL);
 	result = dns_name_dup(name, res->mctx, &fctx->name);