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nfsd4: exchange_id: check creds before killing confirmed client 

We mustn't allow a client to destroy another client with established
state unless it has the right credential.

And some minor cleanup.

(Note: our comparison of credentials is actually pretty bogus currently;
that will need to be fixed in another patch.)

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2012-05-12 21:08:41 -04:00
parent 2786cc3a05
commit ea236d0704
1 changed files with 8 additions and 9 deletions
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17
fs/nfsd/nfs4state.c
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@ -1556,6 +1556,14 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
status = nfserr_clid_inuse; /* XXX: ? */
goto out;
}
if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
/* 18.35.4 case 9 */
if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A)
status = nfserr_perm;
else /* case 3 */
status = nfserr_clid_inuse;
goto out;
}
if (!same_verf(&verf, &conf->cl_verifier)) {
/* 18.35.4 case 8 */
if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
@ -1566,15 +1574,6 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
expire_client(conf);
goto out_new;
}
if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
/* 18.35.4 case 9 */
if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
status = nfserr_perm;
goto out;
}
expire_client(conf);
goto out_new;
}
/*
* Set bit when the owner id and verifier map to an already
* confirmed client id (18.35.3).