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

2020-06-18 Thread Greg KH
On Wed, Jun 10, 2020 at 04:58:44AM +, Zhang, Qiang wrote: > 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. I do not

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

2020-06-09 Thread Zhang, Qiang
___ 发件人: Greg KH 发送时间: 2020年6月9日 17:48 收件人: Zhang, Qiang 抄送: ba...@kernel.org; linux-...@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 A: http://en.wikipedia.org/wiki/Top_post Q: Were do I find info abo

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

2020-06-09 Thread Greg KH
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 incl

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

2020-06-09 Thread Zhang, Qiang
linux-kernel@vger.kernel.org 主题: Re: [PATCH v2] usb: gadget: function: printer: fix use-after-free in __lock_acquire On Mon, Jun 08, 2020 at 03:16:22PM +0800, qiang.zh...@windriver.com wrote: > From: Zqiang > > Increase the reference count of the printer dev through kref to avoid >

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

2020-06-08 Thread Greg KH
On Mon, Jun 08, 2020 at 03:16:22PM +0800, qiang.zh...@windriver.com wrote: > From: Zqiang > > Increase the reference count of the printer dev through kref to avoid > being released by other tasks when in use. > > BUG: KASAN: use-after-free in __lock_acquire+0x3fd4/0x4180 > kernel/locking/lockdep

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

2020-06-08 Thread qiang.zhang
From: Zqiang Increase the reference count of the printer dev through kref to avoid being released by other tasks when in use. BUG: KASAN: use-after-free in __lock_acquire+0x3fd4/0x4180 kernel/locking/lockdep.c:3831 Read of size 8 at addr 8880683b0018 by task syz-executor.0/3377 CPU: 1 PID: