[PATCH 1/1][T/X/B/C/D] cdrom: fix improper type cast, which can leat to information leak.
Tyler Hicks
tyhicks at canonical.com
Tue Nov 20 00:48:41 UTC 2018
From: Young_X <YangX92 at hotmail.com>
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 at hotmail.com>
Signed-off-by: Jens Axboe <axboe at kernel.dk>
CVE-2018-18710
(cherry picked from commit e4f3aa2e1e67bb48dfbaaf1cad59013d5a5bc276)
Signed-off-by: Tyler Hicks <tyhicks at canonical.com>
---
drivers/cdrom/cdrom.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index 104cd4f7a2dd..7c2c520cc1b4 100644
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -2441,7 +2441,7 @@ 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;
}
--
2.7.4
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