linux-kernel - [PATCH 5/9] KEYS: Call ->free_preparse() even after ->preparse() returns an error

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Message-ID: <20131104162253.10177.71310.stgit@warthog.procyon.org.uk>
Date:	Mon, 04 Nov 2013 16:22:53 +0000
From:	David Howells <dhowells@...hat.com>
To:	d.kasatkin@...sung.com, zohar@...ibm.com
Cc:	keyrings@...ux-nfs.org, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 5/9] KEYS: Call ->free_preparse() even after ->preparse()
 returns an error

Call the ->free_preparse() key type op even after ->preparse() returns an
error as it does cleaning up type stuff.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 Documentation/security/keys.txt |    4 +++-
 security/keys/key.c             |    9 ++++-----
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/Documentation/security/keys.txt b/Documentation/security/keys.txt
index 315cf96a41a2..3bbec087fc5f 100644
--- a/Documentation/security/keys.txt
+++ b/Documentation/security/keys.txt
@@ -1176,7 +1176,9 @@ The structure has a number of fields, some of which are mandatory:
      This method is only required if the preparse() method is provided,
      otherwise it is unused.  It cleans up anything attached to the
      description, type_data and payload fields of the key_preparsed_payload
-     struct as filled in by the preparse() method.
+     struct as filled in by the preparse() method.  If will always be called
+     after preparse() returns successfully, even if instantiate() or update()
+     succeed.
 
 
  (*) int (*instantiate)(struct key *key, struct key_preparsed_payload *prep);
diff --git a/security/keys/key.c b/security/keys/key.c
index 1af0edacd804..d77c09f0c48e 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -500,7 +500,7 @@ int key_instantiate_and_link(struct key *key,
 	if (keyring) {
 		ret = __key_link_begin(keyring, &key->index_key, &edit);
 		if (ret < 0)
-			goto error_free_preparse;
+			goto error;
 	}
 
 	ret = __key_instantiate_and_link(key, &prep, keyring, authkey, &edit);
@@ -508,10 +508,9 @@ int key_instantiate_and_link(struct key *key,
 	if (keyring)
 		__key_link_end(keyring, &key->index_key, edit);
 
-error_free_preparse:
+error:
 	if (key->type->preparse)
 		key->type->free_preparse(&prep);
-error:
 	return ret;
 }
 
@@ -828,7 +827,7 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref,
 		ret = index_key.type->preparse(&prep);
 		if (ret < 0) {
 			key_ref = ERR_PTR(ret);
-			goto error_put_type;
+			goto error_free_prep;
 		}
 		if (!index_key.description)
 			index_key.description = prep.description;
@@ -970,9 +969,9 @@ int key_update(key_ref_t key_ref, const void *payload, size_t plen)
 
 	up_write(&key->sem);
 
+error:
 	if (key->type->preparse)
 		key->type->free_preparse(&prep);
-error:
 	return ret;
 }
 EXPORT_SYMBOL(key_update);

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