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KEYS: Fix some sparse warnings 

Fix some sparse warnings in the keyrings code:

 (1) compat_keyctl_instantiate_key_iov() should be static.

 (2) There were a couple of places where a pointer was being compared against
     integer 0 rather than NULL.

 (3) keyctl_instantiate_key_common() should not take a __user-labelled iovec
     pointer as the caller must have copied the iovec to kernel space.

 (4) __key_link_begin() takes and __key_link_end() releases
     keyring_serialise_link_sem under some circumstances and so this should be
     declared.

     Note that adding __acquires() and __releases() for this doesn't help cure
     the warnings messages - something only commenting out both helps.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
This commit is contained in:
David Howells 2012-05-21 12:32:13 +01:00 committed by James Morris
parent ff2bb047c4
commit 423b978802
4 changed files with 6 additions and 4 deletions
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4
security/keys/compat.c
View File

@ -24,7 +24,7 @@
*
* If successful, 0 will be returned.
*/
long compat_keyctl_instantiate_key_iov(
static long compat_keyctl_instantiate_key_iov(
key_serial_t id,
const struct compat_iovec __user *_payload_iov,
unsigned ioc,
@ -33,7 +33,7 @@ long compat_keyctl_instantiate_key_iov(
struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
long ret;
if (_payload_iov == 0 || ioc == 0)
if (!_payload_iov || !ioc)
goto no_payload;
ret = compat_rw_copy_check_uvector(WRITE, _payload_iov, ioc,

2
security/keys/internal.h
View File

@ -240,7 +240,7 @@ extern long keyctl_instantiate_key_iov(key_serial_t,
extern long keyctl_invalidate_key(key_serial_t);
extern long keyctl_instantiate_key_common(key_serial_t,
const struct iovec __user *,
const struct iovec *,
unsigned, size_t, key_serial_t);
/*

2
security/keys/keyctl.c
View File

@ -1106,7 +1106,7 @@ long keyctl_instantiate_key_iov(key_serial_t id,
struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
long ret;
if (_payload_iov == 0 || ioc == 0)
if (!_payload_iov || !ioc)
goto no_payload;
ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc,

2
security/keys/keyring.c
View File

@ -751,6 +751,7 @@ static void keyring_unlink_rcu_disposal(struct rcu_head *rcu)
int __key_link_begin(struct key *keyring, const struct key_type *type,
const char *description, unsigned long *_prealloc)
__acquires(&keyring->sem)
__acquires(&keyring_serialise_link_sem)
{
struct keyring_list *klist, *nklist;
unsigned long prealloc;
@ -960,6 +961,7 @@ void __key_link(struct key *keyring, struct key *key,
void __key_link_end(struct key *keyring, struct key_type *type,
unsigned long prealloc)
__releases(&keyring->sem)
__releases(&keyring_serialise_link_sem)
{
BUG_ON(type == NULL);
BUG_ON(type->name == NULL);