block: fix NULL pointer dereference in register_disk
commit 4d7c1d3fd7c7eda7dea351f071945e843a46c145 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
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@ -652,10 +652,12 @@ exit:
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kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
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disk_part_iter_exit(&piter);
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err = sysfs_create_link(&ddev->kobj,
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&disk->queue->backing_dev_info->dev->kobj,
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"bdi");
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WARN_ON(err);
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if (disk->queue->backing_dev_info->dev) {
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err = sysfs_create_link(&ddev->kobj,
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&disk->queue->backing_dev_info->dev->kobj,
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"bdi");
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WARN_ON(err);
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}
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}
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/**
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