Commit 2e85fbaf authored Oct 12, 2018 by Damien Le Moal Committed by Jens Axboe Oct 25, 2018

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>

parent a91e1380

block/blk-zoned.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -355,8 +355,7 @@ 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;
		rep.nr_zones = min(blkdev_nr_zones(bdev), rep.nr_zones);

		zones = kvmalloc_array(rep.nr_zones, sizeof(struct blk_zone),
		GFP_KERNEL \| __GFP_ZERO);