Fix check for BN_mod_inverse_ct return value

ok jsing@ millert@ tb@

1 files changed, 2 insertions, 2 deletions

diff --git a/src/lib/libcrypto/rsa/rsa_chk.c b/src/lib/libcrypto/rsa/rsa_chk.c
index 807eae084e..ac9dbf7a22 100644
--- a/src/lib/libcrypto/rsa/rsa_chk.c
+++ b/src/lib/libcrypto/rsa/rsa_chk.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: rsa_chk.c,v 1.15 2022/01/10 00:03:02 tb Exp $ */
+/* $OpenBSD: rsa_chk.c,v 1.16 2022/01/20 11:08:12 inoguchi Exp $ */
 /* ====================================================================
  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
  *
@@ -199,7 +199,7 @@ RSA_check_key(const RSA *key)
                 }
 
                 /* iqmp = q^-1 mod p? */
-                if (!BN_mod_inverse_ct(i, key->q, key->p, ctx)) {
+                if (BN_mod_inverse_ct(i, key->q, key->p, ctx) == NULL) {
                         ret = -1;
                         goto err;
                 }