btrfs: replace empty string with NULL when getting attribute length in btrfs_get_acl
authorChengguang Xu <cgxu519@gmx.com>
Wed, 27 Jun 2018 04:16:35 +0000 (12:16 +0800)
committerDavid Sterba <dsterba@suse.com>
Mon, 6 Aug 2018 11:12:40 +0000 (13:12 +0200)
commit7e35eab958e30d15743b1f9928d15b559a6e432d
tree30c1696236fb3b1707a026bcdae8213633f90bed
parentab3629ed86ec43e7d95cf087d0b5a9d403fcd822
btrfs: replace empty string with NULL when getting attribute length in btrfs_get_acl

In btrfs_get_acl() the first call of btr_getxattr() is for getting the
length of attribute, the value buffer is never used in this case. So
it's better to replace empty string with NULL.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
fs/btrfs/acl.c