linux-kernel - Re: [PATCH] xhci: Cancel cmd_timer before cleanup the command queue in xhci_hc

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Message-ID: <20171101163947.GA8206@kroah.com>
Date:   Wed, 1 Nov 2017 17:39:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Mathias Nyman <mathias.nyman@...el.com>
Cc:     Jeffy Chen <jeffy.chen@...k-chips.com>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH] xhci: Cancel cmd_timer before cleanup the command queue
 in xhci_hc_died()

On Wed, Nov 01, 2017 at 06:28:01PM +0200, Mathias Nyman wrote:
> On 01.11.2017 18:03, Greg Kroah-Hartman wrote:
> > On Fri, Sep 29, 2017 at 05:12:47PM +0800, Jeffy Chen wrote:
> > > When the cmd_timer fired, it would try to access the command struct.
> > > So cancel it before cleanup the command queue in xhci_hc_died(), to
> > > avoid use-after-free reported by KASAN:
> > > [  176.952537] BUG: KASAN: use-after-free in xhci_handle_command_timeout+0x68/0x224
> > > [  176.960846] Write of size 4 at addr ffffffc0cbb01608 by task kworker/3:3/1680
> > > ...
> > > [  177.180644] Freed by task 0:
> > > [  177.183882]  kasan_slab_free+0x90/0x15c
> > > [  177.188194]  kfree+0x114/0x28c
> > > [  177.191630]  xhci_cleanup_command_queue+0xc8/0xf8
> > > [  177.196916]  xhci_hc_died+0x84/0x358
> > > 
> > > Fixes: d9f11ba9f107 ("xhci: Rework how we handle unresponsive or hoptlug removed hosts")
> > > Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
> > > ---
> > 
> > Mathias, did you miss this one?  Want me to queue it up?
> > 
> 
> There is a v2 of that patch already upstreamed.
> 
> d1aad52 xhci: Cleanup current_cmd in xhci_cleanup_command_queue()
> 
> https://marc.info/?l=linux-usb&m=150668331802206&w=2
> 
> A bit confusing as patch subject changed as well in v2

Ah, thanks, missed that.

greg k-h