linux-kernel - Re: [PATCH] misc: hpilo: Fix use-after-free in ilo

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Message-ID: <Y7AHvYfZreO/G/kT@kroah.com>
Date:   Sat, 31 Dec 2022 10:58:21 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yoochan Lee <yoochan1026@...il.com>
Cc:     matt.hsiao@....com, arnd@...db.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] misc: hpilo: Fix use-after-free in ilo_open

On Sat, Dec 31, 2022 at 02:53:10PM +0900, Yoochan Lee 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;

This is obviously incorrect, please never have 2 reference counts for
the same structure.

greg k-h