From 0bcc7ca40bd823193224e9f38bafbd8325aaf566 Mon Sep 17 00:00:00 2001
From: "J. Bruce Fields" <bfields@redhat.com>
Date: Tue, 24 Aug 2021 22:36:03 -0400
Subject: [PATCH] nfsd: fix crash on LOCKT on reexported NFSv3
Unlike other filesystems, NFSv3 tries to use fl_file in the GETLK case.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
fs/nfsd/nfs4state.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 1b6a7f48982ed..4b6d60b46b0ac 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -7043,8 +7043,7 @@ out:
/*
* The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
* so we do a temporary open here just to get an open file to pass to
- * vfs_test_lock. (Arguably perhaps test_lock should be done with an
- * inode operation.)
+ * vfs_test_lock.
*/
static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
{
@@ -7059,7 +7058,9 @@ static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct
NFSD_MAY_READ));
if (err)
goto out;
+ lock->fl_file = nf->nf_file;
err = nfserrno(vfs_test_lock(nf->nf_file, lock));
+ lock->fl_file = NULL;
out:
fh_unlock(fhp);
nfsd_file_put(nf);
--
2.30.2