From: Christoph Hellwig hch@lst.de
[ Upstream commit d90db3b1c8676bc88b4309c5a571333de2263b8e ]
Zero out the pointer to ->slave_dir so that the holder code doesn't incorrectly treat the object as alive when add_disk failed or after del_gendisk was called.
Fixes: 89f871af1b26 ("dm: delay registering the gendisk") Reported-by: Yu Kuai yukuai3@huawei.com Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Yu Kuai yukuai3@huawei.com Reviewed-by: Mike Snitzer snitzer@kernel.org Link: https://lore.kernel.org/r/20221115141054.1051801-2-yukuai1@huaweicloud.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- block/genhd.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/block/genhd.c b/block/genhd.c index 044ff97381e3..28654723bc2b 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -522,6 +522,7 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk, rq_qos_exit(disk->queue); out_put_slave_dir: kobject_put(disk->slave_dir); + disk->slave_dir = NULL; out_put_holder_dir: kobject_put(disk->part0->bd_holder_dir); out_del_integrity: @@ -618,6 +619,7 @@ void del_gendisk(struct gendisk *disk)
kobject_put(disk->part0->bd_holder_dir); kobject_put(disk->slave_dir); + disk->slave_dir = NULL;
part_stat_set_all(disk->part0, 0); disk->part0->bd_stamp = 0;