Commit c8099dbf authored by Young_X's avatar Young_X Committed by Greg Kroah-Hartman

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

commit e4f3aa2e 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: default avatarYoung_X <YangX92@hotmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f9de7e61
...@@ -2445,7 +2445,7 @@ static int cdrom_ioctl_select_disc(struct cdrom_device_info *cdi, ...@@ -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;
} }
......
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