static int dispatch_discard_io(struct xen_blkif *blkif,
				struct blkif_request *req)
{
	int err = 0;
 	int status = BLKIF_RSP_OKAY;
 	struct block_device *bdev = blkif->vbd.bdev;
 	unsigned long secure;
 
 	blkif->st_ds_req++;
 
 	xen_blkif_get(blkif);
	secure = (blkif->vbd.discard_secure &&
		 (req->u.discard.flag & BLKIF_DISCARD_SECURE)) ?
		 BLKDEV_DISCARD_SECURE : 0;

 	err = blkdev_issue_discard(bdev, req->u.discard.sector_number,
 				   req->u.discard.nr_sectors,
 				   GFP_KERNEL, secure);
 	if (err == -EOPNOTSUPP) {
 		pr_debug(DRV_PFX "discard op failed, not supported\n");
 		status = BLKIF_RSP_EOPNOTSUPP;
	} else if (err)
		status = BLKIF_RSP_ERROR;

	make_response(blkif, req->u.discard.id, req->operation, status);
	xen_blkif_put(blkif);
	return err;
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.