Messages in this thread | | | From | "Zhang, Qiang" <> | Subject | 回复: 回复: [PATCH v2] usb: gadget: function: printer: fix use-after-free in lock acquir e | Date | Wed, 10 Jun 2020 04:58:44 +0000 |
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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@linuxfoundation.org> 发送时间: 2020年6月9日 17:48 收件人: Zhang, Qiang 抄送: balbi@kernel.org; linux-usb@vger.kernel.org; linux-kernel@vger.kernel.org 主题: Re: 回复: [PATCH v2] usb: gadget: function: printer: fix use-after-free in __lock_acquire
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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
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