1 files changed, 5 insertions, 3 deletions

diff --git a/src/lib/libcrypto/bn/bn_exp.c b/src/lib/libcrypto/bn/bn_exp.c
index 4944daa48c..b756d2b305 100644
--- a/src/lib/libcrypto/bn/bn_exp.c
+++ b/src/lib/libcrypto/bn/bn_exp.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_exp.c,v 1.42 2023/03/27 10:21:23 tb Exp $ */
+/* $OpenBSD: bn_exp.c,v 1.43 2023/03/27 10:22:47 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -165,8 +165,10 @@ BN_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
         ret = 1;
 
 err:
-        if (r != rr && rr != NULL)
-                BN_copy(r, rr);
+        if (r != rr && rr != NULL) {
+                if (!bn_copy(r, rr))
+                        ret = 0;
+        }
         BN_CTX_end(ctx);
         return (ret);
 }