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

[Andreas Gruenbacher]

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

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