encrypted_keys: avoid dumping the master key if the request fails

Do not dump the master key if an error is encountered during the request.

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Acked-by: Gianluca Ramunno <ramunno@polito.it>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>

security/keys/encrypted.c

@@ -378,10 +378,12 @@ static struct key *request_master_key(struct encrypted_key_payload *epayload,
 	} else
 		goto out;
 
-	if (IS_ERR(mkey))
+	if (IS_ERR(mkey)) {
 		pr_info("encrypted_key: key %s not found",
 			epayload->master_desc);
-	if (mkey)
+		goto out;
+	}
+
 	dump_master_key(*master_key, *master_keylen);
 out:
 	return mkey;