The handling of DSA_METHOD and DH_METHOD wasn't quite as problematic as

with RSA_METHOD (the **_get_default_methods do set the default value if
it's not set). However, the code had some duplication and was a bit
conter-intuitive.

crypto/dh/dh_lib.c

@@ -103,9 +103,8 @@ DH *DH_new_method(DH_METHOD *meth)
 		DHerr(DH_F_DH_NEW,ERR_R_MALLOC_FAILURE);
 		return(NULL);
 		}
-	if(!default_DH_method) default_DH_method = DH_OpenSSL();
 	if(meth) ret->meth = meth;
-	else ret->meth = default_DH_method;
+	else ret->meth = DH_get_default_method();
 	ret->pad=0;
 	ret->version=0;
 	ret->p=NULL;

crypto/dsa/dsa_lib.c

@@ -107,9 +107,8 @@ DSA *DSA_new_method(DSA_METHOD *meth)
 		DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE);
 		return(NULL);
 		}
-	if(!default_DSA_method) default_DSA_method = DSA_OpenSSL();
 	if(meth) ret->meth = meth;
-	else ret->meth = default_DSA_method;
+	else ret->meth = DSA_get_default_method();
 	ret->pad=0;
 	ret->version=0;
 	ret->write_params=1;