Re: [BUG] possible race between md_free_disk and md_notify_reboot

[Guillaume Morin]

On 20 Feb 11:19, Yu Kuai wrote:
>
> Hi,
> 
> 在 2025/02/20 11:05, Guillaume Morin 写道:
> > how it was guaranteed that mddev_get() would fail as mddev_free() does not check or synchronize with the active atomic
> 
> Please check how mddev is freed, start from mddev_put(). There might be
> something wrong, but it's not what you said.

I will take a look. Though if you're confident that this logic protects
any uaf, that makes sense to me.

However as I mentioned this is not what the crash was about (I mentioned
the UAF in passing). The GPF seems to be about deleting the _next_
pointer while iterating over all mddevs. The mddev_get on the
current item is not going to help with this.

-- 
Guillaume Morin <guillaume@xxxxxxxxxxx>