evp_pmeth: free the MD reference correctly.

The code was calling EVP_MD_meth_free which is incorrect.  It should call
EVP_MD_free.  It happened to work but by luck rather than design.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10973)

diff --git a/crypto/evp/pmeth_lib.c b/crypto/evp/pmeth_lib.c
index dda9358c4e2969b70deb71155498aaa46b4a512d..075e87fe1c205a6c35594a84d7f9d0e990d45f07 100644 (file)
--- a/crypto/evp/pmeth_lib.c
+++ b/crypto/evp/pmeth_lib.c
@@ -834,7 +834,7 @@ static int legacy_ctrl_str_to_param(EVP_PKEY_CTX *ctx, const char *name,
         if (md == NULL)
             return 0;
         ret = EVP_PKEY_CTX_set_signature_md(ctx, md);
-        EVP_MD_meth_free(md);
+        EVP_MD_free(md);
         return ret;
     }