| From | Ben Hutchings <> | Date | Sun, 09 Dec 2018 21:50:33 +0000 | Subject | [PATCH 3.16 328/328] cdrom: fix improper type cast, which can leat to information leak. |
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3.16.62-rc1 review patch. If anyone has any objections, please let me know.
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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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