linux-kernel - Re: [PATCH] usbip: vhci_hcd: check port number before using

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Message-ID: <CADVatmOZ943m_bmXS9vQs8Fy73aaG1PNP1YCzX-J2HN_f5Zigw@mail.gmail.com>
Date:   Mon, 8 Oct 2018 21:01:13 +0100
From:   Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:     Shuah Khan <shuah@...nel.org>
Cc:     Valentina Manea <valentina.manea.m@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-usb@...r.kernel.org,
        syzbot+600b03e0cf1b73bb23c4@...kaller.appspotmail.com,
        Stable <stable@...r.kernel.org>
Subject: Re: [PATCH] usbip: vhci_hcd: check port number before using

On Mon, Oct 8, 2018 at 8:29 PM Shuah Khan <shuah@...nel.org> wrote:
>
> Hi Sudip,
>
> On 10/08/2018 01:19 PM, Sudip Mukherjee wrote:
> > From: Sudip Mukherjee <sudipm.mukherjee@...il.com>
> >
> > The port number is checked and it just prints an error message but it
> > still continues to use the invalid port. And as a result it accesses
> > memory which is not its resulting in  BUG report from KASAN.
>
> Yes there is an issue with out of bounds access. But this isn't the
> right fix.
>
> >
> > Reported-by: syzbot+600b03e0cf1b73bb23c4@...kaller.appspotmail.com
> > Cc: stable <stable@...r.kernel.org>
> > Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
>
> I sent in a fix for this last Friday.
>
> https://patchwork.kernel.org/patch/10628833/

And I can confirm this patch also fixes the issue tested with the
reproducer I was using in my vm.


-- 
Regards
Sudip