dm: don't call report zones for more than the user requested

Don't call report zones for more zones than the user actually requested,
otherwise this can lead to out-of-bounds accesses in the callback
functions.

Such a situation can happen if the target's ->report_zones() callback
function returns 0 because we've reached the end of the target and then
restart the report zones on the second target.

We're again calling into ->report_zones() and ultimately into the user
supplied callback function but when we're not subtracting the number of
zones already processed this may lead to out-of-bounds accesses in the
user callbacks.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Fixes: d41003513e61 ("block: rework zone reporting")
Cc: stable@vger.kernel.org # v5.5+
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 52449af..937a419 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -503,7 +503,8 @@ static int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
                }
 
                args.tgt = tgt;
-               ret = tgt->type->report_zones(tgt, &args, nr_zones);
+               ret = tgt->type->report_zones(tgt, &args,
+                                             nr_zones - args.zone_idx);
                if (ret < 0)
                        goto out;
        } while (args.zone_idx < nr_zones &&