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Subject: Re: [GIT PULL] USB fixes for 5.9-rc3
To:     Andy Shevchenko <andy.shevchenko@gmail.com>,
        Greg KH <gregkh@linuxfoundation.org>
Cc:     Brooke Basile <brookebasile@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        USB <linux-usb@vger.kernel.org>,
        Ilja Van Sprundel <ivansprundel@ioactive.com>,
        Kees Cook <keescook@chromium.org>,
        Felipe Balbi <balbi@kernel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
From:   Marek Szyprowski <m.szyprowski@samsung.com>
Message-ID: <de6aea2f-5f31-4391-0c36-8fd5fd63ab05@samsung.com>
Date:   Wed, 26 Aug 2020 18:17:24 +0200
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Hi Andy,

On 26.08.2020 17:53, Andy Shevchenko wrote:
> On Wed, Aug 26, 2020 at 6:36 PM Greg KH <gregkh@linuxfoundation.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@samsung.com>

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>

Thanks!

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland