linux-kernel - Re: [PATCH 9/9] serial: xuartps: Fix out-of-bounds access through DT alias

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Date:   Tue, 20 Feb 2018 13:39:25 +0100
From:   Michal Simek <michal.simek@...inx.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Michal Simek <michal.simek@...inx.com>
CC:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Barry Song <baohua@...nel.org>,
        Vineet Gupta <vgupta@...opsys.com>,
        Jiri Slaby <jslaby@...e.com>, <linux-serial@...r.kernel.org>,
        arcml <linux-snps-arc@...ts.infradead.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 9/9] serial: xuartps: Fix out-of-bounds access through DT
 alias

On 20.2.2018 13:27, Geert Uytterhoeven wrote:
> Hi Michal,
> 
> On Tue, Feb 20, 2018 at 12:27 PM, Michal Simek <michal.simek@...inx.com> wrote:
>> On 20.2.2018 11:38, Geert Uytterhoeven wrote:
>>> On Tue, Feb 20, 2018 at 11:22 AM, Michal Simek <michal.simek@...inx.com> wrote:
>>>> On 20.2.2018 10:40, Geert Uytterhoeven wrote:
>>>>> The cdns_uart_port[] array is indexed using a value derived from the
>>>>> "serialN" alias in DT, which may lead to an out-of-bounds access.
>>>>>
>>>>> Fix this by adding a range check.
> 
>> I have checked 4 patches I have sent in past which didn't reach mainline
>> (probably because of RFC)
>> Take a look at
>> https://www.spinics.net/lists/linux-serial/msg27106.html
>>
>> I have removed cdns_uart_port array completely there.
> 
> Nice! I'd love to get rid of fixed arrays in serial...
> 
> However, IMHO it's still worthwhile to fix the out-of-bounds access first,
> as that fix can be backported to stable kernels easily.

I agree with you. Not a problem with your patch and for me it won't be
problem to rebase.

I would love to get rid of CDNS_UART_NR_PORTS but unfortunately this is
passed to core via .nr.

Thanks,
Michal