linux-kernel - [PATCH 3.2 073/164] nfsd: fix the check for confirmed openowner in nfs4_preprocess_stateid

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Message-ID: <lsq.1438473757.188305285@decadent.org.uk>
Date:	Sun, 02 Aug 2015 01:02:37 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Christoph Hellwig" <hch@....de>,
	"J. Bruce Fields" <bfields@...hat.com>
Subject: [PATCH 3.2 073/164] nfsd: fix the check for confirmed openowner
 in nfs4_preprocess_stateid_op

3.2.70-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Christoph Hellwig <hch@....de>

commit ebe9cb3bb13e7b9b281969cd279ce70834f7500f upstream.

If we find a non-confirmed openowner we jump to exit the function, but do
not set an error value.  Fix this by factoring out a helper to do the
check and properly set the error from nfsd4_validate_stateid.

Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: J. Bruce Fields <bfields@...hat.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/nfsd/nfs4state.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -3272,10 +3272,17 @@ static int check_stateid_generation(stat
 	return nfserr_old_stateid;
 }
 
+static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
+{
+	if (ols->st_stateowner->so_is_open_owner &&
+	    !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
+		return nfserr_bad_stateid;
+	return nfs_ok;
+}
+
 __be32 nfs4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
 {
 	struct nfs4_stid *s;
-	struct nfs4_ol_stateid *ols;
 	__be32 status;
 
 	if (STALE_STATEID(stateid))
@@ -3289,11 +3296,7 @@ __be32 nfs4_validate_stateid(struct nfs4
 		return status;
 	if (!(s->sc_type & (NFS4_OPEN_STID | NFS4_LOCK_STID)))
 		return nfs_ok;
-	ols = openlockstateid(s);
-	if (ols->st_stateowner->so_is_open_owner
-	    && !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
-		return nfserr_bad_stateid;
-	return nfs_ok;
+	return nfsd4_check_openowner_confirmed(openlockstateid(s));
 }
 
 static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, struct nfs4_stid **s)
@@ -3360,8 +3363,8 @@ nfs4_preprocess_stateid_op(struct nfsd4_
 		status = nfs4_check_fh(current_fh, stp);
 		if (status)
 			goto out;
-		if (stp->st_stateowner->so_is_open_owner
-		    && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
+		status = nfsd4_check_openowner_confirmed(stp);
+		if (status)
 			goto out;
 		status = nfs4_check_openmode(stp, flags);
 		if (status)

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