4.18-stable 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 Cc: Ben Hutchings ben.hutchings@codethink.co.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/cdrom/cdrom.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/cdrom/cdrom.c +++ b/drivers/cdrom/cdrom.c @@ -2441,7 +2441,7 @@ 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; }