4.8-stable review patch. If anyone has any objections, please let me know.
------------------ From: Miklos Szeredi <[email protected]> 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 <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- fs/overlayfs/copy_up.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -171,6 +171,8 @@ 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);
