Fix check for BN_mod_inverse_ct return value

ok jsing@ millert@ tb@

diff --git a/lib/libcrypto/ec/ecp_smpl.c b/lib/libcrypto/ec/ecp_smpl.c
index 1d0b1d6..6f5280b 100644 (file)
--- a/lib/libcrypto/ec/ecp_smpl.c
+++ b/lib/libcrypto/ec/ecp_smpl.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ecp_smpl.c,v 1.33 2021/09/08 17:29:21 tb Exp $ */
+/* $OpenBSD: ecp_smpl.c,v 1.34 2022/01/20 11:02:44 inoguchi Exp $ */
 /* Includes code written by Lenka Fibikova <fibikova@exp-math.uni-essen.de>
  * for the OpenSSL project.
  * Includes code written by Bodo Moeller for the OpenSSL project.
@@ -586,7 +586,7 @@ ec_GFp_simple_point_get_affine_coordinates(const EC_GROUP * group, const EC_POIN
                        }
                }
        } else {
-               if (!BN_mod_inverse_ct(Z_1, Z_, &group->field, ctx)) {
+               if (BN_mod_inverse_ct(Z_1, Z_, &group->field, ctx) == NULL) {
                        ECerror(ERR_R_BN_LIB);
                        goto err;
                }
@@ -1316,7 +1316,7 @@ ec_GFp_simple_points_make_affine(const EC_GROUP * group, size_t num, EC_POINT *
 
        /* invert heap[1] */
        if (!BN_is_zero(heap[1])) {
-               if (!BN_mod_inverse_ct(heap[1], heap[1], &group->field, ctx)) {
+               if (BN_mod_inverse_ct(heap[1], heap[1], &group->field, ctx) == NULL) {
                        ECerror(ERR_R_BN_LIB);
                        goto err;
                }