ovl: skip copy up of empty security.capability

ovl_copy_xattr() gives up if it can't read an attribute that
listxattr() has named.  An empty security.capability, which anybody has
been able to store on any file for a long time, is such a case: it is
listed, and getxattr() has nothing to return for it.  A file in a lower
layer that carries one can't be copied up: it can't be written to,
renamed or have its mode changed.

There is nothing to copy if there are no data.  Go on with the next
one.

Fixes: 8db6c34f1dbc ("Introduce v3 namespaced file capabilities")
Cc: stable@vger.kernel.org
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
[amir: treat -EINVAL as no capability too, and do the same in
 ovl_copy_up_meta_inode_data()]
Signed-off-by: Amir Goldstein <amir73il@gmail.com>

0 files changed, 0 insertions, 0 deletions