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/sm2/sm2_sign.c b/src/lib/libcrypto/sm2/sm2_sign.c
index d306658a48..b35de841b1 100644
--- a/src/lib/libcrypto/sm2/sm2_sign.c
+++ b/src/lib/libcrypto/sm2/sm2_sign.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: sm2_sign.c,v 1.1.1.1 2021/08/18 16:04:32 tb Exp $ */
+/*      $OpenBSD: sm2_sign.c,v 1.2 2022/01/20 11:12:14 inoguchi Exp $ */
 /*
  * Copyright (c) 2017, 2019 Ribose Inc
  *
@@ -194,7 +194,7 @@ sm2_sig_gen(const EC_KEY *key, const BIGNUM *e)
                         goto err;
                 }
 
-                if (!BN_mod_inverse_ct(s, s, order, ctx)) {
+                if (BN_mod_inverse_ct(s, s, order, ctx) == NULL) {
                         SM2error(ERR_R_BN_LIB);
                         goto err;
                 }