smb: client: mask server-provided mode to 07777 in modefromsid

commit e3d9c71 upstream.

When modefromsid is active, parse_dacl() applies the server-provided
sub_auth[2] value from the NFS mode SID to cf_mode without masking to
07777. Apply the correct masking, same as in the read path.

Fixes: e2f8fbf ("cifs: get mode bits from special sid on stat")
Signed-off-by: Norbert Manthey <nmanthey@amazon.de>
Assisted-by: Kiro:claude-opus-4.6
Cc: stable@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: nmanthey

fs/smb/client/cifsacl.c

@@ -890,7 +890,7 @@ static void parse_dacl(struct smb_acl *pdacl, char *end_of_acl,
 				 */
 				fattr->cf_mode &= ~07777;
 				fattr->cf_mode |=
-					le32_to_cpu(ppace[i]->sid.sub_auth[2]);
+					le32_to_cpu(ppace[i]->sid.sub_auth[2]) & 07777;
 				break;
 			} else {
 				if (compare_sids(&(ppace[i]->sid), pownersid) == 0) {