Patch "ovl: fsync after copy-up" has been added to the 4.4-stable tree

Patch "ovl: fsync after copy-up" has been added to the 4.4-stable tree

[gregkh]

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

    ovl: fsync after copy-up

to the 4.4-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:
     ovl-fsync-after-copy-up.patch
and it can be found in the queue-4.4 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 641089c1549d8d3df0b047b5de7e9a111362cdce Mon Sep 17 00:00:00 2001
From: Miklos Szeredi <mszeredi@redhat.com>
Date: Mon, 31 Oct 2016 14:42:14 +0100
Subject: ovl: fsync after copy-up

From: Miklos Szeredi <mszeredi@redhat.com>

commit 641089c1549d8d3df0b047b5de7e9a111362cdce upstream.

Make sure the copied up file hits the disk before renaming to the final
destination.  If this is not done then the copy-up may corrupt the data in
the file in case of a crash.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/overlayfs/copy_up.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -139,6 +139,8 @@ static int ovl_copy_up_data(struct path
 		len -= bytes;
 	}
 
+	if (!error)
+		error = vfs_fsync(new_file, 0);
 	fput(new_file);
 out_fput:
 	fput(old_file);


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

queue-4.4/ovl-fsync-after-copy-up.patch