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authorJohannes Thumshirn <johannes.thumshirn@wdc.com>2020-08-04 18:25:01 +0900
committerMike Snitzer <snitzer@redhat.com>2020-08-04 16:31:12 -0400
commita9cb9f4148ef6bb8fabbdaa85c42b2171fbd5a0d (patch)
treeb654fb3bc10227350f6dd79b519b2deda5a0b83c /drivers/md/dm.c
parent4cb6f22612511ff2aba4c33fb0f281cae7c23772 (diff)
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>
Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r--drivers/md/dm.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 52449afd58eb..937a4194442f 100644
--- 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 &&