From 9cc8a834665988c7088bf387381bc18ff9aad45a Mon Sep 17 00:00:00 2001
From: Kazuki Yamaguchi <k@rhe.jp>
Date: Wed, 11 Dec 2024 00:59:37 +0900
Subject: [PATCH] digest: make output buffer String independent in #finish

Likewise, OpenSSL::Digest#finish needs to make the output buffer
independent before writing to it.
---
 ext/openssl/ossl_digest.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ext/openssl/ossl_digest.c b/ext/openssl/ossl_digest.c
index fc326ec14..015d8eb58 100644
--- a/ext/openssl/ossl_digest.c
+++ b/ext/openssl/ossl_digest.c
@@ -232,6 +232,7 @@ ossl_digest_finish(int argc, VALUE *argv, VALUE self)
         str = rb_str_new(NULL, out_len);
     } else {
         StringValue(str);
+        rb_str_modify(str);
         rb_str_resize(str, out_len);
     }