linux-kernel - [PATCH] tty/vt: check allocation size in con_set

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Message-Id: <20200603102804.2110817-1-efremov@linux.com>
Date:   Wed,  3 Jun 2020 13:28:04 +0300
From:   Denis Efremov <efremov@...ux.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>
Cc:     Denis Efremov <efremov@...ux.com>, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH] tty/vt: check allocation size in con_set_unimap()

The vmemdup_user() function has no 2-factor argument form. Use array_size()
to check for the overflow.

Cc: Kees Cook <keescook@...omium.org>
Signed-off-by: Denis Efremov <efremov@...ux.com>
---
 drivers/tty/vt/consolemap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c
index b28aa0d289f8..32acea9e8270 100644
--- a/drivers/tty/vt/consolemap.c
+++ b/drivers/tty/vt/consolemap.c
@@ -542,7 +542,7 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
 	if (!ct)
 		return 0;
 
-	unilist = vmemdup_user(list, ct * sizeof(struct unipair));
+	unilist = vmemdup_user(list, array_size(sizeof(struct unipair), ct));
 	if (IS_ERR(unilist))
 		return PTR_ERR(unilist);
 
-- 
2.26.2