From 7a0e4048bfd16848ac115b17f49a3df7993a2fac Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Mon, 9 Dec 2019 11:10:32 +0000
Subject: [PATCH] fs/adfs: newdir: improve directory validation

Check that the lastmask and reserved fields are all zero, as per the
documentation.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 fs/adfs/dir_f.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/adfs/dir_f.c b/fs/adfs/dir_f.c
index 196706d581bf6..ebe8616ee533e 100644
--- a/fs/adfs/dir_f.c
+++ b/fs/adfs/dir_f.c
@@ -127,6 +127,7 @@ static int adfs_f_validate(struct adfs_dir *dir)
 	struct adfs_newdirtail *tail = dir->newtail;
 
 	if (head->startmasseq != tail->endmasseq ||
+	    tail->dirlastmask || tail->reserved[0] || tail->reserved[1] ||
 	    (memcmp(&head->startname, "Nick", 4) &&
 	     memcmp(&head->startname, "Hugo", 4)) ||
 	    memcmp(&head->startname, &tail->endname, 4) ||
-- 
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