linux-kernel - [patch] KEYS: Fix an error code in request_master

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Date:   Fri, 16 Dec 2016 12:08:27 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:     David Safford <safford@...ibm.com>,
        David Howells <dhowells@...hat.com>,
        James Morris <james.l.morris@...cle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] KEYS: Fix an error code in request_master_key()

This function has two callers and neither are able to handle a NULL
return.  Really, -EINVAL is the correct thing return here anyway.  This
fixes some static checker warnings like:

	security/keys/encrypted-keys/encrypted.c:709 encrypted_key_decrypt()
	error: uninitialized symbol 'master_key'.

Fixes: 7e70cb497850 ("keys: add new key-type encrypted")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/security/keys/encrypted-keys/encrypted.c b/security/keys/encrypted-keys/encrypted.c
index 17a06105ccb6..d7a4969b2dd3 100644
--- a/security/keys/encrypted-keys/encrypted.c
+++ b/security/keys/encrypted-keys/encrypted.c
@@ -437,7 +437,7 @@ static struct skcipher_request *init_skcipher_req(const u8 *key,
 static struct key *request_master_key(struct encrypted_key_payload *epayload,
 				      const u8 **master_key, size_t *master_keylen)
 {
-	struct key *mkey = NULL;
+	struct key *mkey = ERR_PTR(-EINVAL);
 
 	if (!strncmp(epayload->master_desc, KEY_TRUSTED_PREFIX,
 		     KEY_TRUSTED_PREFIX_LEN)) {