linux-kernel - Re: syztest

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Message-ID: <a166383d-a19a-deb4-e170-2350f8fdafd0@huaweicloud.com>
Date: Wed, 30 Jul 2025 14:09:16 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Arnaud Lecomte <contact@...aud-lcm.com>,
 syzbot+fa3a12519f0d3fd4ec16@...kaller.appspotmail.com
Cc: linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
 "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: syztest

Hi,

在 2025/07/30 13:51, Arnaud Lecomte 写道:
> #syz test
> 
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -5978,10 +5978,6 @@ struct mddev *md_alloc(dev_t dev, char *name)
>   
>   	disk->events |= DISK_EVENT_MEDIA_CHANGE;
>   	mddev->gendisk = disk;
> -	error = add_disk(disk);
> -	if (error)
> -		goto out_put_disk;
> -
>   	kobject_init(&mddev->kobj, &md_ktype);
>   	error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");

This is wrong, you can't add mddev >kobj under the disk without
kobject_add for the disk kobj.

Thanks,
Kuai

>   	if (error) {
> @@ -5999,6 +5995,9 @@ struct mddev *md_alloc(dev_t dev, char *name)
>   	kobject_uevent(&mddev->kobj, KOBJ_ADD);
>   	mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state");
>   	mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level");
> +	error = add_disk(disk);
> +	if (error)
> +		goto out_put_disk;
>   	mutex_unlock(&disks_mutex);
>   	return mddev;
>   
>