linux-kernel - Re: [PATCH] xhci-ring: Fix Null pointer dereference

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Message-ID: <CAPybu_1Tzik3yegY2rrXKd7ii1Bzn-ep-gXG5MDZ-rJ2D71-Rw@mail.gmail.com>
Date:	Wed, 27 Aug 2014 16:14:01 +0200
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Mathias Nyman <mathias.nyman@...el.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xhci-ring: Fix Null pointer dereference

At least I have seen the issue on Debian 3.14 and 3.16. Is your patch
going to be backported to linux-stable? The computer crashes very very
badly

On Wed, Aug 27, 2014 at 4:25 PM, Mathias Nyman <mathias.nyman@...el.com> wrote:
> On 08/26/2014 06:47 PM, Ricardo Ribalda Delgado wrote:
>> While testing a usb gadget I managed to crash completely the host
>> computer. This was due to a NULL pointer derefence.
>>
>> This patch avoids the crash although the kernel still outputs some
>> warnings.
>>
>> Without this patch, kernels from (at least) 3.14 can be crashed with
>> mass storage gadgets.
>>
>> Affected host:  NEC Corporation uPD720200 USB 3.0
>>
>
>
> This should not be necessary anymore after
> commit 365038d83313951d6ace15342eb24624bbef1666
>     xhci: rework cycle bit checking for new dequeue pointers
>
> http://marc.info/?l=linux-usb&m=140844993115671&w=2
>
> Which was just added to Greg's usb-linus branch.
> It checks that the new_deq_ptr and new_deq_seg are valid before calling
> xhci_queue_new_dequeue_state()
>
> -Mathias
>
>
>
>
>



-- 
Ricardo Ribalda
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