linux-kernel - Re: [PATCH 0/2] phy: ocelot-serdes: fix out-of-bounds bug

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Message-ID: <bbaed401-0ea1-f5bb-43b9-0e38bcdbdfa5@embeddedor.com>
Date:   Tue, 9 Oct 2018 16:13:13 +0200
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Quentin Schulz <quentin.schulz@...tlin.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kishon Vijay Abraham I <kishon@...com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] phy: ocelot-serdes: fix out-of-bounds bug



On 10/9/18 9:28 AM, Quentin Schulz wrote:
> Hi Gustavo,
> 
> On Tue, Oct 09, 2018 at 12:20:28AM +0200, Gustavo A. R. Silva wrote:
>> This patchset aims to fix an out-of-bounds bug in
>> the phy-ocelot-serdes driver.
>>
>> Currently, there is an out-of-bounds read on array ctrl->phys,
>> once variable i reaches the maximum array size of SERDES_MAX
>> in the for loop.
>>
>> Quentin Schulz pointed out that SERDES_MAX is a valid value to
>> index ctrl->phys. So, I updated SERDES_MAX to be SERDES6G_MAX + 1
>> in include/dt-bindings/phy/phy-ocelot-serdes.h.
>>
>> Then I changed the condition in the for loop from
>> i <= SERDES_MAX to i < SERDES_MAX in order to
>> complete the fix.
>>
>> The reason I'm sending this fix as series is because
>> checkpatch reported an error when I first tried to
>> integrate the whole solution into a singe patch. So,
>> changes to dt-bindings should be sent as a separate
>> patch.
>>
> 
> Much appreciated, thank you!
> 

Glad to help. :)

Thanks
--
Gustavo