linux-kernel - [PATCH 4.9 38/41] KEYS: Fix an error code in request_master

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Message-Id: <20170710171053.570133323@linuxfoundation.org>
Date:   Mon, 10 Jul 2017 19:11:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        James Morris <james.l.morris@...cle.com>
Subject: [PATCH 4.9 38/41] KEYS: Fix an error code in request_master_key()

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 57cb17e764ba0aaa169d07796acce54ccfbc6cae upstream.

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>
Acked-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
Signed-off-by: James Morris <james.l.morris@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 security/keys/encrypted-keys/encrypted.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/security/keys/encrypted-keys/encrypted.c
+++ b/security/keys/encrypted-keys/encrypted.c
@@ -437,7 +437,7 @@ static struct skcipher_request *init_skc
 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)) {