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

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Message-ID: <20181009072853.t4jjqdlvc4g735hm@qschulz>
Date:   Tue, 9 Oct 2018 09:28:53 +0200
From:   Quentin Schulz <quentin.schulz@...tlin.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.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

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!

Quentin

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