[PATCH] block: Fix potential overflow in blk_report_zones()

[Damien Le Moal]

For large values of the number of zones reported, the sector increment
calculated with "blk_queue_zone_sectors(q) * n" can overflow the
unsigned int type used. Fix this with a cast to sector_t type.

Fixes: e76239a3748c ("block: add a report_zones method")
Cc: sta...@vger.kernel.org
Signed-off-by: Damien Le Moal <damien.lem...@wdc.com>
---
 block/blk-zoned.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index 79ad269b545d..231b7e1b6d22 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -134,7 +134,7 @@ static int blk_report_zones(struct gendisk *disk, sector_t 
sector,
                        return ret;
                if (!n)
                        break;
-               sector += blk_queue_zone_sectors(q) * n;
+               sector += (sector_t)blk_queue_zone_sectors(q) * n;
                z += n;
        }
 
-- 
2.21.0