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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>
This commit is contained in:
Young_X 2018-10-03 12:54:29 +00:00 committed by Jens Axboe
parent fb6360b1ef
commit e4f3aa2e1e
1 changed files with 1 additions and 1 deletions
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2
drivers/cdrom/cdrom.c
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@ -2445,7 +2445,7 @@ static int cdrom_ioctl_select_disc(struct cdrom_device_info *cdi,
return -ENOSYS; return -ENOSYS;
if (arg != CDSL_CURRENT && arg != CDSL_NONE) { if (arg != CDSL_CURRENT && arg != CDSL_NONE) {
if ((int)arg >= cdi->capacity) if (arg >= cdi->capacity)
return -EINVAL; return -EINVAL;
} }