Ruby OpenSSL RSA sign patch

ruby-openssl-fix.diff

diff --git ext/openssl/ossl_pkey.c ext/openssl/ossl_pkey.c
index f785e66..2384676 100644
--- ext/openssl/ossl_pkey.c
+++ ext/openssl/ossl_pkey.c
@@ -237,6 +237,7 @@ ossl_pkey_sign(VALUE self, VALUE digest, VALUE data)
     EVP_MD_CTX ctx;
     unsigned int buf_len;
     VALUE str;
+    int result;
 
     if (rb_funcall(self, id_private_q, 0, NULL) != Qtrue) {
        ossl_raise(rb_eArgError, "Private key is needed.");
@@ -246,7 +247,9 @@ ossl_pkey_sign(VALUE self, VALUE digest, VALUE data)
     StringValue(data);
     EVP_SignUpdate(&ctx, RSTRING_PTR(data), RSTRING_LEN(data));
     str = rb_str_new(0, EVP_PKEY_size(pkey)+16);
-    if (!EVP_SignFinal(&ctx, (unsigned char *)RSTRING_PTR(str), &buf_len, pkey))
+    result = EVP_SignFinal(&ctx, (unsigned char *)RSTRING_PTR(str), &buf_len, pkey);
+    EVP_MD_CTX_cleanup(&ctx);
+    if (!result)
        ossl_raise(ePKeyError, NULL);
     assert((long)buf_len <= RSTRING_LEN(str));
     rb_str_set_len(str, buf_len);