From eb08a285899df82056f712421988c6ccd0b58ba6 Mon Sep 17 00:00:00 2001 From: Scott Bauer Date: Thu, 26 Apr 2018 11:51:08 -0600 Subject: cdrom: Fix info leak/OOB read in cdrom_ioctl_drive_status commit 8f3fafc9c2f0ece10832c25f7ffcb07c97a32ad4 upstream. Like d88b6d04: "cdrom: information leak in cdrom_ioctl_media_changed()" 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(). Signed-off-by: Scott Bauer Signed-off-by: Scott Bauer Cc: stable@vger.kernel.org Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- 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 0151039bff05..1012b2cb6a16 100644 --- a/drivers/cdrom/cdrom.c +++ b/drivers/cdrom/cdrom.c @@ -2526,7 +2526,7 @@ static int cdrom_ioctl_drive_status(struct cdrom_device_info *cdi, if (!CDROM_CAN(CDC_SELECT_DISC) || (arg == CDSL_CURRENT || arg == CDSL_NONE)) return cdi->ops->drive_status(cdi, CDSL_CURRENT); - if (((int)arg >= cdi->capacity)) + if (arg >= cdi->capacity) return -EINVAL; return cdrom_slot_status(cdi, arg); } -- cgit v1.2.3