From 03c5db001e79e40011c3478e14593cdad72c5c1d Mon Sep 17 00:00:00 2001
From: Mark Andrews <marka@isc.org>
Date: Mon, 26 Sep 2022 11:57:17 +1000
Subject: [PATCH] Check that 'e' and 'n' are allocated in opensslrsa_fromdns

Conflict: NA
Reference: https://gitlab.isc.org/isc-projects/bind9/-/commit/03c5db001e79e40011c3478e14593cdad72c5c1d
(cherry picked from commit db70c302138f02b6e1fca6e89cf2da35b2ca0ae4)
---
 lib/dns/opensslrsa_link.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/dns/opensslrsa_link.c b/lib/dns/opensslrsa_link.c
index b23b6323fa..b744a62df9 100644
--- a/lib/dns/opensslrsa_link.c
+++ b/lib/dns/opensslrsa_link.c
@@ -671,6 +671,11 @@ opensslrsa_fromdns(dst_key_t *key, isc_buffer_t *data) {
 	e = BN_bin2bn(r.base, e_bytes, NULL);
 	isc_region_consume(&r, e_bytes);
 	n = BN_bin2bn(r.base, r.length, NULL);
+	if (e == NULL || n == NULL) {
+		RSA_free(rsa);
+		return (ISC_R_NOMEMORY);
+	}
+
 	if (RSA_set0_key(rsa, n, e, NULL) == 0) {
 		if (n != NULL) {
 			BN_free(n);
-- 
2.23.0