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From:   Lei Yu <yulei.sh@bytedance.com>
Date:   Wed, 21 Dec 2022 10:26:25 +0800
Message-ID: <CAGm54UHWhRQsvaBQM7mgfP2A5os=mYDTfKS9qfS0C5_9XkcrSA@mail.gmail.com>
Subject: RE: [PATCH] usb: gadget: aspeed: fix buffer overflow
To:     Neal Liu <neal_liu@aspeedtech.com>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Felipe Balbi <balbi@kernel.org>, Joel Stanley <joel@jms.id.au>,
        Andrew Jeffery <andrew@aj.id.au>,
        Henry Tian <tianxiaofeng@bytedance.com>,
        Jakob Koschel <jakobkoschel@gmail.com>,
        "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-aspeed@lists.ozlabs.org" <linux-aspeed@lists.ozlabs.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Ryan Chen <ryan_chen@aspeedtech.com>
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On Wed, Dec 21, 2022 at 10:17 AM Neal Liu <neal_liu@aspeedtech.com> wrote:
> > > > > > Using rndis is able to set MTU to 2000, and the issue can be
> > reproduced.
> >
> > USB ecm is also tested and it is possible to set MTU to 2000, and could
> > reproduce the issue.
> > So I think this patch is needed anyway.
> >
> > @Neal Liu Could you kindly help to verify the USB ECM case?
>
> How to set MTU to 2000 on USB ECM case? I remember last time I cannot set by using "ifconfig ..."
> Regardless ECM or RNDIS, I agree this patch is still needed.

You were able to set MTU to 2000 for RNDIS but not for NCM.
@Greg Kroah-Hartman indicated that RNDIS should not be used anymore.
So I tested ECM and verified it could set MTU 2000 and the issue could
be reproduced.