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

[Zhang, Qiang]

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@xxxxxxxxxxxxxxxxxxx>
发送时间: 2020年6月9日 17:48
收件人: Zhang, Qiang
抄送: balbi@xxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
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