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. Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx> --- block/blk-zoned.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/block/blk-zoned.c b/block/blk-zoned.c index 32e377f755d8..f2c8b859fc18 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -334,6 +334,7 @@ int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, struct request_queue *q; struct blk_zone_report rep; struct blk_zone *zones; + 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; zones = kvmalloc_array(rep.nr_zones, sizeof(struct blk_zone), GFP_KERNEL | __GFP_ZERO); -- 2.17.1 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
