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knfsd: LOOKUP can return an illegal error value

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commit e221c45da3 upstream.

The 'NFS error' NFSERR_OPNOTSUPP is not described by any of the official
NFS related RFCs, but appears to have snuck into some older .x files for
NFSv2.
Either way, it is not in RFC1094, RFC1813 or any of the NFSv4 RFCs, so
should not be returned by the knfsd server, and particularly not by the
"LOOKUP" operation.

Instead, let's return NFSERR_STALE, which is more appropriate if the
filesystem encodes the filehandle as FILEID_INVALID.

Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Trond Myklebust 2024-05-06 12:30:04 -04:00 committed by Greg Kroah-Hartman
parent a4d9818ff5
commit 4f2fd2a378
1 changed files with 2 additions and 2 deletions
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4
fs/nfsd/nfsfh.c
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@ -569,7 +569,7 @@ fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
_fh_update(fhp, exp, dentry);
if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) {
fh_put(fhp);
return nfserr_opnotsupp;
return nfserr_stale;
}
return 0;
@ -595,7 +595,7 @@ fh_update(struct svc_fh *fhp)
_fh_update(fhp, fhp->fh_export, dentry);
if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID)
return nfserr_opnotsupp;
return nfserr_stale;
return 0;
out_bad:
printk(KERN_ERR "fh_update: fh not verified!\n");