linux-kernel - Re: [PATCH] misc: hpilo: Fix use after free bug in ilo_remove due to race condition with ilo

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Message-ID: <CAJedcCx_BxWyJFje+iwsJXoW0bngUD79cBuj+VSv08azDN1FjQ@mail.gmail.com>
Date:   Wed, 19 Apr 2023 13:29:15 +0800
From:   Zheng Hacker <hackerzheng666@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Zheng Wang <zyytlz.wz@....com>, matt.hsiao@....com, arnd@...db.de,
        linux-kernel@...r.kernel.org, 1395428693sheep@...il.com,
        alex000young@...il.com
Subject: Re: [PATCH] misc: hpilo: Fix use after free bug in ilo_remove due to
 race condition with ilo_open

Greg KH <gregkh@...uxfoundation.org> 于2023年4月18日周二 01:43写道：
>
> On Tue, Apr 18, 2023 at 12:52:46AM +0800, Zheng Wang wrote:
> > --- a/drivers/misc/hpilo.h
> > +++ b/drivers/misc/hpilo.h
> > @@ -62,6 +62,7 @@ struct ilo_hwinfo {
> >       spinlock_t fifo_lock;
> >
> >       struct cdev cdev;
> > +     struct kref refcnt;
>
> You now have 2 different structures doing reference counting logic on
> the same structure.  That's just not ok at all, and is totally broken.
>

Thanks for your reply. I'll look into it and figure out effective fix.

Best regards,
Zheng

> greg k-h