linux-kernel - [PATCH 3.16 46/63] cdrom: Fix info leak/OOB read in cdrom_ioctl_drive

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Message-ID: <lsq.1537575342.526149378@decadent.org.uk>
Date:   Sat, 22 Sep 2018 01:15:42 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Scott Bauer" <sbauer@...donthack.me>,
        "Scott Bauer" <scott.bauer@...el.com>,
        "Jens Axboe" <axboe@...nel.dk>
Subject: [PATCH 3.16 46/63] cdrom: Fix info leak/OOB read in
 cdrom_ioctl_drive_status

3.16.58-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Scott Bauer <scott.bauer@...el.com>

commit 8f3fafc9c2f0ece10832c25f7ffcb07c97a32ad4 upstream.

Like d88b6d04: "cdrom: information leak in cdrom_ioctl_media_changed()"

There is another cast from unsigned long to int which causes
a bounds check to fail with specially crafted input. The value is
then used as an index in the slot array in cdrom_slot_status().

Signed-off-by: Scott Bauer <scott.bauer@...el.com>
Signed-off-by: Scott Bauer <sbauer@...donthack.me>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/cdrom/cdrom.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -2528,7 +2528,7 @@ static int cdrom_ioctl_drive_status(stru
 	if (!CDROM_CAN(CDC_SELECT_DISC) ||
 	    (arg == CDSL_CURRENT || arg == CDSL_NONE))
 		return cdi->ops->drive_status(cdi, CDSL_CURRENT);
-	if (((int)arg >= cdi->capacity))
+	if (arg >= cdi->capacity)
 		return -EINVAL;
 	return cdrom_slot_status(cdi, arg);
 }