block: Limit allocation of zone descriptors for report zones
There is no point in allocating more zone descriptors than the number of zones a block device has for doing a zone report. Avoid doing that in blkdev_report_zones_ioctl() by limiting the number of zone decriptors allocated internally to process the user request. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -355,8 +355,7 @@ int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
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if (!rep.nr_zones)
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return -EINVAL;
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if (rep.nr_zones > INT_MAX / sizeof(struct blk_zone))
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return -ERANGE;
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rep.nr_zones = min(blkdev_nr_zones(bdev), rep.nr_zones);
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zones = kvmalloc_array(rep.nr_zones, sizeof(struct blk_zone),
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GFP_KERNEL | __GFP_ZERO);
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