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Subject[PATCH 3.16 328/328] cdrom: fix improper type cast, which can leat to information leak.
3.16.62-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Young_X <YangX92@hotmail.com>

commit e4f3aa2e1e67bb48dfbaaf1cad59013d5a5bc276 upstream.

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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/cdrom/cdrom.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -2427,7 +2427,7 @@ static int cdrom_ioctl_select_disc(struc
return -ENOSYS;

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

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