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

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Message-ID: <20200609094848.GA533476@kroah.com>
Date:   Tue, 9 Jun 2020 11:48:48 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "Zhang, Qiang" <Qiang.Zhang@...driver.com>
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: Re: 回复: [PATCH v2] usb: gadget: function: printer: fix use-after-free in __lock_acquire

A: http://en.wikipedia.org/wiki/Top_post
Q: Were do I find info about this thing called top-posting?
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

A: No.
Q: Should I include quotations after my reply?

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