Commit 4d7c1d3f authored Feb 20, 2019 by zhengbin Committed by Jens Axboe Feb 28, 2019

block: fix NULL pointer dereference in register_disk



If __device_add_disk-->bdi_register_owner-->bdi_register-->
bdi_register_va-->device_create_vargs fails, bdi->dev is still
NULL, __device_add_disk-->register_disk will visit bdi->dev->kobj.
This patch fixes that.

Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent dce30ca9

block/genhd.c

+6 −4

Original line number	Diff line number	Diff line
		@@ -655,11 +655,13 @@ exit:
		kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
		disk_part_iter_exit(&piter);

		if (disk->queue->backing_dev_info->dev) {
		err = sysfs_create_link(&ddev->kobj,
		&disk->queue->backing_dev_info->dev->kobj,
		"bdi");
		WARN_ON(err);
		}
		}

		/**
		* __device_add_disk - add disk information to kernel list

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