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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: d41003513e ("block: rework zone reporting")
Cc: stable@vger.kernel.org # v5.5+
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Johannes Thumshirn 2020-08-04 18:25:01 +09:00 committed by Mike Snitzer
parent 4cb6f22612
commit a9cb9f4148
1 changed files with 2 additions and 1 deletions
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3
drivers/md/dm.c
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@ -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 &&