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authorJeff Layton <jlayton@poochiereds.net>2015-07-30 06:57:46 -0400
committerJ. Bruce Fields <bfields@redhat.com>2015-07-31 16:30:26 -0400
commit8fcd461db7c09337b6d2e22d25eb411123f379e3 (patch)
tree85e3bea7f6c723cb1bc1a2d0deca9bca98a83fd0 /fs
parentnfsd: Fix a file leak on nfsd4_layout_setlease failure (diff)
downloadlinux-dev-8fcd461db7c09337b6d2e22d25eb411123f379e3.tar.xz
linux-dev-8fcd461db7c09337b6d2e22d25eb411123f379e3.zip
nfsd: do nfs4_check_fh in nfs4_check_file instead of nfs4_check_olstateid
Currently, preprocess_stateid_op calls nfs4_check_olstateid which verifies that the open stateid corresponds to the current filehandle in the call by calling nfs4_check_fh. If the stateid is a NFS4_DELEG_STID however, then no such check is done. This could cause incorrect enforcement of permissions, because the nfsd_permission() call in nfs4_check_file uses current the current filehandle, but any subsequent IO operation will use the file descriptor in the stateid. Move the call to nfs4_check_fh into nfs4_check_file instead so that it can be done for all stateid types. Signed-off-by: Jeff Layton <jeff.layton@primarydata.com> Cc: stable@vger.kernel.org [bfields: moved fh check to avoid NULL deref in special stateid case] Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfsd/nfs4state.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 61dfb33f0559..95202719a1fd 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4396,9 +4396,9 @@ laundromat_main(struct work_struct *laundry)
queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
}
-static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
+static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
{
- if (!fh_match(&fhp->fh_handle, &stp->st_stid.sc_file->fi_fhandle))
+ if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
return nfserr_bad_stateid;
return nfs_ok;
}
@@ -4601,9 +4601,6 @@ nfs4_check_olstateid(struct svc_fh *fhp, struct nfs4_ol_stateid *ols, int flags)
{
__be32 status;
- status = nfs4_check_fh(fhp, ols);
- if (status)
- return status;
status = nfsd4_check_openowner_confirmed(ols);
if (status)
return status;
@@ -4690,6 +4687,9 @@ nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
status = nfserr_bad_stateid;
break;
}
+ if (status)
+ goto out;
+ status = nfs4_check_fh(fhp, s);
done:
if (!status && filpp)
@@ -4798,7 +4798,7 @@ static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_
status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
if (status)
return status;
- return nfs4_check_fh(current_fh, stp);
+ return nfs4_check_fh(current_fh, &stp->st_stid);
}
/*