Commit e4f3aa2e authored Oct 03, 2018 by Young_X Committed by Jens Axboe Oct 03, 2018

cdrom: fix improper type cast, which can leat to information leak.



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().

This issue is similar to CVE-2018-16658 and CVE-2018-10940.

Signed-off-by: Young_X <YangX92@hotmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent fb6360b1

drivers/cdrom/cdrom.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2445,7 +2445,7 @@ static int cdrom_ioctl_select_disc(struct cdrom_device_info *cdi,
		return -ENOSYS;

		if (arg != CDSL_CURRENT && arg != CDSL_NONE) {
		if ((int)arg >= cdi->capacity)
		if (arg >= cdi->capacity)
		return -EINVAL;
		}

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