linux-kernel - Re: usb/misc/ims-pcu: slab-out-of-bounds in ims_pcu_parse_cdc

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Message-ID: <CAAeHK+wLAiNYDNDBALoJb07BgqivPWkBJxHyYWwiba9hPTNoTA@mail.gmail.com>
Date:   Thu, 2 Nov 2017 17:28:27 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Johan Hovold <johan@...nel.org>,
        Arvind Yadav <arvind.yadav.cs@...il.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: usb/misc/ims-pcu: slab-out-of-bounds in ims_pcu_parse_cdc_data

On Thu, Nov 2, 2017 at 5:25 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> Hi Andrey,
>
> On Thu, Nov 2, 2017 at 9:13 AM, Andrey Konovalov <andreyknvl@...gle.com> wrote:
>> On Sat, Oct 7, 2017 at 8:14 PM, Dmitry Torokhov
>> <dmitry.torokhov@...il.com> wrote:
>>> On Thu, Sep 28, 2017 at 01:35:51PM +0200, Andrey Konovalov wrote:
>>>> Hi!
>>>>
>>>> I've got the following report while fuzzing the kernel with syzkaller.
>>>>
>>>> On commit dc972a67cc54585bd83ad811c4e9b6ab3dcd427e (4.14-rc2+).
>>>>
>>>> There's no check that the length of intf->altsetting->extra is big
>>>> enough to hold usb_cdc_union_desc struct.
>>>
>>> Can you please tell me if the following works for you?
>>
>> Hi Dmitry,
>>
>> Could you mail this patch upstream?
>
> It is already there:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/input/misc/ims-pcu.c?id=ea04efee7635c9120d015dcdeeeb6988130cb67a

Totally missed this, thanks!

>
> Thanks.
>
> --
> Dmitry