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nfsd: silence sparse warning about accessing credentials

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sparse says:

    fs/nfsd/auth.c:31:38: warning: incorrect type in argument 1 (different address spaces)
    fs/nfsd/auth.c:31:38:    expected struct cred const *cred
    fs/nfsd/auth.c:31:38:    got struct cred const [noderef] <asn:4>*real_cred

Add a new accessor for the ->real_cred and use that to fetch the
pointer. Accessing current->real_cred directly is actually quite safe
since we know that they can't go away so this is mostly a cosmetic fixup
to silence sparse.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2014-07-15 12:59:36 -04:00 committed by J. Bruce Fields
parent b0fc29d6fc
commit ae4b884fc6
2 changed files with 10 additions and 1 deletions
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2
fs/nfsd/auth.c
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@ -28,7 +28,7 @@ int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
validate_process_creds();
/* discard any old override before preparing the new set */
revert_creds(get_cred(current->real_cred));
revert_creds(get_cred(current_real_cred()));
new = prepare_creds();
if (!new)
return -ENOMEM;

9
include/linux/cred.h
View file

@ -258,6 +258,15 @@ static inline void put_cred(const struct cred *_cred)
#define current_cred() \
rcu_dereference_protected(current->cred, 1)
/**
* current_real_cred - Access the current task's objective credentials
*
* Access the objective credentials of the current task. RCU-safe,
* since nobody else can modify it.
*/
#define current_real_cred() \
rcu_dereference_protected(current->real_cred, 1)
/**
* __task_cred - Access a task's objective credentials
* @task: The task to query