From fcf4654a77782cbee997539bf97fd6b5e29d5168 Mon Sep 17 00:00:00 2001
From: slontis <shane.lontis@oracle.com>
Date: Fri, 1 Jul 2022 13:47:11 +1000
Subject: [PATCH] Fix bn_gcd code to check return value when calling BN_one()

BN_one() uses the expand function which calls malloc which may fail.
All other places that reference BN_one() check the return value.

The issue is triggered by a memory allocation failure.
Detected by PR #18355

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18697)