[PATCH v10 39/46] ext4: Don't allow unmapped identifiers in richacls

[Andreas Gruenbacher <andreas.gruenbacher@xxxxxxxxx>]

From: 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/ext4/richacl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/ext4/richacl.c b/fs/ext4/richacl.c
index b46ac60..2581117 100644
--- a/fs/ext4/richacl.c
+++ b/fs/ext4/richacl.c
@@ -62,6 +62,10 @@ __ext4_set_richacl(handle_t *handle, struct inode *inode, 
struct richacl *acl)
        int retval;
 
        if (acl) {
+               /* Don't allow acls with unmapped identifiers. */
+               if (richacl_has_unmapped_identifiers(acl))
+                       return -EINVAL;
+
                if (richacl_equiv_mode(acl, &mode) == 0) {
                        inode->i_ctime = ext4_current_time(inode);
                        inode->i_mode = mode;
-- 
2.5.0