Patch "NFS: Revert "NFS: Move the flock open mode check into nfs_flock()"" has been added to the 4.14-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    NFS: Revert "NFS: Move the flock open mode check into nfs_flock()"

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfs-revert-nfs-move-the-flock-open-mode-check-into-nfs_flock.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From fcfa447062b2061e11f68b846d61cbfe60d0d604 Mon Sep 17 00:00:00 2001
From: Benjamin Coddington <bcodding@redhat.com>
Date: Fri, 10 Nov 2017 06:27:49 -0500
Subject: NFS: Revert "NFS: Move the flock open mode check into nfs_flock()"

From: Benjamin Coddington <bcodding@redhat.com>

commit fcfa447062b2061e11f68b846d61cbfe60d0d604 upstream.

Commit e12937279c8b "NFS: Move the flock open mode check into nfs_flock()"
changed NFSv3 behavior for flock() such that the open mode must match the
lock type, however that requirement shouldn't be enforced for flock().

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/nfs/file.c     |   18 ++----------------
 fs/nfs/nfs4proc.c |   14 ++++++++++++++
 2 files changed, 16 insertions(+), 16 deletions(-)

--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -829,23 +829,9 @@ int nfs_flock(struct file *filp, int cmd
 	if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
 		is_local = 1;
 
-	/*
-	 * VFS doesn't require the open mode to match a flock() lock's type.
-	 * NFS, however, may simulate flock() locking with posix locking which
-	 * requires the open mode to match the lock type.
-	 */
-	switch (fl->fl_type) {
-	case F_UNLCK:
+	/* We're simulating flock() locks using posix locks on the server */
+	if (fl->fl_type == F_UNLCK)
 		return do_unlk(filp, cmd, fl, is_local);
-	case F_RDLCK:
-		if (!(filp->f_mode & FMODE_READ))
-			return -EBADF;
-		break;
-	case F_WRLCK:
-		if (!(filp->f_mode & FMODE_WRITE))
-			return -EBADF;
-	}
-
 	return do_setlk(filp, cmd, fl, is_local);
 }
 EXPORT_SYMBOL_GPL(nfs_flock);
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6568,6 +6568,20 @@ nfs4_proc_lock(struct file *filp, int cm
 	    !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
 		return -ENOLCK;
 
+	/*
+	 * Don't rely on the VFS having checked the file open mode,
+	 * since it won't do this for flock() locks.
+	 */
+	switch (request->fl_type) {
+	case F_RDLCK:
+		if (!(filp->f_mode & FMODE_READ))
+			return -EBADF;
+		break;
+	case F_WRLCK:
+		if (!(filp->f_mode & FMODE_WRITE))
+			return -EBADF;
+	}
+
 	status = nfs4_set_lock_state(state, request);
 	if (status != 0)
 		return status;


Patches currently in stable-queue which might be from bcodding@redhat.com are

queue-4.14/nfs-revert-nfs-move-the-flock-open-mode-check-into-nfs_flock.patch