[PATCH v11 41/48] xfs: Don't allow unmapped identifiers in richacls

[Andreas Gruenbacher <agruenba@xxxxxxxxxx>]

Don't allow acls which contain unmapped identifiers: they are meaningful
for remote file systems only.

Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
---
 fs/xfs/xfs_richacl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/xfs/xfs_richacl.c b/fs/xfs/xfs_richacl.c
index 73c2d24..4f938b7 100644
--- a/fs/xfs/xfs_richacl.c
+++ b/fs/xfs/xfs_richacl.c
@@ -77,6 +77,10 @@ xfs_set_richacl(struct inode *inode, struct richacl *acl)
        if (!acl)
                return xfs_remove_richacl(inode);
 
+       /* Don't allow acls with unmapped identifiers. */
+       if (richacl_has_unmapped_identifiers(acl))
+               return -EINVAL;
+
        if (richacl_equiv_mode(acl, &mode) == 0) {
                xfs_set_mode(inode, mode);
                return xfs_remove_richacl(inode);
-- 
2.5.0