1 files changed, 5 insertions, 3 deletions

diff --git a/src/lib/libcrypto/bn/bn_sqr.c b/src/lib/libcrypto/bn/bn_sqr.c
index 6e784541bd..6641b77592 100644
--- a/src/lib/libcrypto/bn/bn_sqr.c
+++ b/src/lib/libcrypto/bn/bn_sqr.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bn_sqr.c,v 1.27 2023/02/17 05:13:34 jsing Exp $ */
+/* $OpenBSD: bn_sqr.c,v 1.28 2023/03/27 10:22:47 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -404,8 +404,10 @@ BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
 
         rr->neg = 0;
 
-        if (rr != r)
-                BN_copy(r, rr);
+        if (rr != r) {
+                if (!bn_copy(r, rr))
+                        goto err;
+        }
 
  done:
         ret = 1;