linux-kernel - RE: [PATCH v8 3/3] remoteproc: qcom: q6v5

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Date:   Tue, 16 Nov 2021 22:39:38 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Rakesh Pillai <pillair@...eaurora.org>, agross@...nel.org,
        bjorn.andersson@...aro.org, mathieu.poirier@...aro.org,
        ohad@...ery.com, p.zabel@...gutronix.de, robh+dt@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        sibis@...eaurora.org, mpubbise@...eaurora.org, kuabhs@...omium.org
Subject: RE: [PATCH v8 3/3] remoteproc: qcom: q6v5_wpss: Add support for
 sc7280 WPSS

Quoting Rakesh Pillai (2021-11-16 22:31:51)
>
>
> > -----Original Message-----
> > From: Stephen Boyd <swboyd@...omium.org>
> > Sent: Wednesday, November 17, 2021 4:25 AM
> > To: Rakesh Pillai <pillair@...eaurora.org>; agross@...nel.org;
> > bjorn.andersson@...aro.org; mathieu.poirier@...aro.org; ohad@...ery.com;
> > p.zabel@...gutronix.de; robh+dt@...nel.org
> > Cc: linux-arm-msm@...r.kernel.org; linux-remoteproc@...r.kernel.org;
> > devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> > sibis@...eaurora.org; mpubbise@...eaurora.org; kuabhs@...omium.org
> > Subject: Re: [PATCH v8 3/3] remoteproc: qcom: q6v5_wpss: Add support for
> > sc7280 WPSS
> >
> > Quoting Rakesh Pillai (2021-11-02 06:44:33)
> > > @@ -457,7 +608,13 @@ static int adsp_probe(struct platform_device
> > *pdev)
> > >         if (ret)
> > >                 goto free_rproc;
> > >
> > > -       pm_runtime_enable(adsp->dev);
> > > +       ret = qcom_rproc_pds_attach(adsp->dev, adsp->proxy_pds,
> > > +                                   desc->proxy_pd_names);
> > > +       if (ret < 0) {
> > > +               dev_err(&pdev->dev, "Failed to attach proxy power domains\n");
> > > +               goto free_rproc;
> > > +       }
> > > +       adsp->proxy_pd_count = ret;
> >
> > Can we check this against the define so that we don't have more than the
> > fixed number of power domains and try to access elements beyond the
> > length of the array?
>
> The number of entries populated in the "proxy_pds" array depends on the "desc->proxy_pd_names", which is statically
> initialized for each remoteproc. Hence there will not be any out of bound access for this array.
>

Sure nothing is wrong today but it's a potential problem in the future
if someone adds more elements to proxy_pd_names than proxy_pds can hold.
Please prevent that from happening by writing stricter code.