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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>
This commit is contained in:
Chengguang Xu 2018-06-27 12:16:35 +08:00 committed by David Sterba
parent ab3629ed86
commit 7e35eab958
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/acl.c
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@ -33,7 +33,7 @@ struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
return ERR_PTR(-EINVAL);
}
size = btrfs_getxattr(inode, name, "", 0);
size = btrfs_getxattr(inode, name, NULL, 0);
if (size > 0) {
value = kzalloc(size, GFP_KERNEL);
if (!value)