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Date:   Wed, 26 Aug 2020 13:20:41 -0400
From:   Brooke Basile <brookebasile@...il.com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>,
        Ilja Van Sprundel <ivansprundel@...ctive.com>,
        Kees Cook <keescook@...omium.org>,
        Felipe Balbi <balbi@...nel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [GIT PULL] USB fixes for 5.9-rc3

On 8/26/20 12:17 PM, Marek Szyprowski wrote:
> Hi Andy,
> 
> On 26.08.2020 17:53, Andy Shevchenko wrote:
>> On Wed, Aug 26, 2020 at 6:36 PM Greg KH <gregkh@...uxfoundation.org> wrote:
>>> On Wed, Aug 26, 2020 at 05:02:38PM +0200, Marek Szyprowski wrote:
>>>> On 26.08.2020 15:43, Greg KH wrote:
>>>>
>>>>> Brooke Basile (2):
>>>>>          USB: gadget: u_f: add overflow checks to VLA macros
>>>> Sorry, but the above patch breaks USB Ethernet Gadget operation. It also
>>>> didn't get the proper testing in linux-next (next-20200826 is the first
>>>> one with this patch).
>>>>
>>>> This is how it explodes on Samsung Exynos (ARM 32bit) based board with
>>>> g_ether module loaded:
>>> Odd, for a "normal" descriptor, the logic should have remained the same
>>> as without this patch.
>>> Brooke, any ideas?
>> I have an idea.
>>
>> Does below fix this?
> 
> Yep, that's it. I've also moved offset assignment in the first part
> after size_t size = array_size(n, sizeof(type));
> 
> Feel free to add:
> 
> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
> 
> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> 
> Thanks!
> 
> Best regards
> 
Ah, I see.  My apologies, I don't know how I was able to miss something 
like this when building/testing...

Thank you for testing and reporting the issue.

Best,
Brooke Basile

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