ublk: sanity check add_dev input for underflow

Add additional checks that queue depth and number of queues are
non-zero.

Signed-off-by: Ronnie Sahlberg <[email protected]>
Reviewed-by: Ming Lei <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: RonnieSahlberg

drivers/block/ublk_drv.c

@@ -2849,7 +2849,8 @@ static int ublk_ctrl_add_dev(const struct ublksrv_ctrl_cmd *header)
 	if (copy_from_user(&info, argp, sizeof(info)))
 		return -EFAULT;
 
-	if (info.queue_depth > UBLK_MAX_QUEUE_DEPTH || info.nr_hw_queues > UBLK_MAX_NR_QUEUES)
+	if (info.queue_depth > UBLK_MAX_QUEUE_DEPTH || !info.queue_depth ||
+	    info.nr_hw_queues > UBLK_MAX_NR_QUEUES || !info.nr_hw_queues)
 		return -EINVAL;
 
 	if (capable(CAP_SYS_ADMIN))