linux-kernel - Re: [PATCH v2] xhci: Cleanup current_cmd in xhci_cleanup_command

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Date:   Mon, 2 Oct 2017 14:48:59 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Jeffy Chen <jeffy.chen@...k-chips.com>,
        linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, Mathias Nyman <mathias.nyman@...el.com>
Subject: Re: [PATCH v2] xhci: Cleanup current_cmd in
 xhci_cleanup_command_queue()

On 29.09.2017 14:07, Jeffy Chen wrote:
> KASAN reported use-after-free bug when xhci host controller died:
> [  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
>
> Problem here is that when the cmd_timer fired, it would try to access
> current_cmd while the command queue is already freed by xhci_hc_died().
>
> Cleanup current_cmd in xhci_cleanup_command_queue() to avoid that.
>
> Fixes: d9f11ba9f107 ("xhci: Rework how we handle unresponsive or hoptlug removed hosts")
> Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
> ---
>
>

Thanks, adding patch to queue

-Mathias