[dm-devel] [PATCH 05/11] block: Limit allocation of zone descriptors for report zones

[Christoph Hellwig]

> +	unsigned int nr_zones;
>  	int ret;
>  
>  	if (!argp)
> @@ -355,8 +356,9 @@ int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
>  	if (!rep.nr_zones)
>  		return -EINVAL;
>  
> -	if (rep.nr_zones > INT_MAX / sizeof(struct blk_zone))
> -		return -ERANGE;
> +	nr_zones = blkdev_nr_zones(bdev);
> +	if (rep.nr_zones > nr_zones)
> +		rep.nr_zones = nr_zones;

This could be further simplified using min_t, but othewise it looks fine
to me:

Reviewed-by: Christoph Hellwig <hch at lst.de>