linux-kernel - 回复: 回复: [PATCH v2] usb: gadget: function: printer: fix use-after-free in __lock

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Date:   Wed, 10 Jun 2020 04:58:44 +0000
From:   "Zhang, Qiang" <Qiang.Zhang@...driver.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "balbi@...nel.org" <balbi@...nel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: 回复: 回复: [PATCH v2] usb: gadget: function: printer: fix use-after-free in __lock_acquire

cdev  object reference count and "struct printer_dev" object  reference count(kref), This two reference counts do not conflict.  in file usb-skeleton.c also used a similar method， "struct usb_skel"  contains kref members.

thanks,
Zqiang

________________________________________
发件人: Greg KH <gregkh@...uxfoundation.org>
发送时间: 2020年6月9日 17:48
收件人: Zhang, Qiang
抄送: balbi@...nel.org; linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org
主题: Re: 回复: [PATCH v2] usb: gadget: function: printer: fix use-after-free in __lock_acquire

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A: Top-posting.
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A: No.
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http://daringfireball.net/2007/07/on_top

On Tue, Jun 09, 2020 at 09:35:11AM +0000, Zhang, Qiang wrote:
> Thank you for your suggestion
> two referenced counted objects in the same exact structure. another  referenced is
> "dev->printer_cdev_open"?

Maybe, I don't know, but a cdev does have a reference count already,
right?  Why do you need printer_cdev_open as well?

thanks,

greg k-h