linux-kernel - Re: [PATCH] remoteproc: mediatek: Dereferencing a pointer that might be NULL

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Message-ID: <29643c069485b2c7e49fd9e40c26b60f86a63a86.camel@mediatek.com>
Date:   Thu, 9 Mar 2023 08:24:19 +0000
From:   Jason-ch Chen (陳建豪) 
        <Jason-ch.Chen@...iatek.com>
To:     "mathieu.poirier@...aro.org" <mathieu.poirier@...aro.org>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>
Subject: Re: [PATCH] remoteproc: mediatek: Dereferencing a pointer that might
 be NULL

Hi Mathieu,

On Fri, 2023-03-03 at 11:20 -0700, Mathieu Poirier wrote:
> On Fri, 3 Mar 2023 at 03:28, Jason-ch Chen <
> jason-ch.chen@...iatek.com> wrote:
> > 
> > From: jason-ch chen <Jason-ch.Chen@...iatek.com>
> > 
> > The res might be NULL when calling resource_size.
> > 
> 
> "resource_size" ?  What is that?
> 
> > Signed-off-by: jason-ch chen <Jason-ch.Chen@...iatek.com>
> > ---
> >  drivers/remoteproc/mtk_scp.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/remoteproc/mtk_scp.c
> > b/drivers/remoteproc/mtk_scp.c
> > index eacdf241f4ef..863d18f63f58 100644
> > --- a/drivers/remoteproc/mtk_scp.c
> > +++ b/drivers/remoteproc/mtk_scp.c
> > @@ -829,6 +829,9 @@ static int scp_probe(struct platform_device
> > *pdev)
> >         platform_set_drvdata(pdev, scp);
> > 
> >         res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > "sram");
> > +       if (!res)
> > +               return -ENODEV;
> > +
> 
> Please have a look at the implementation of devm_ioremap_resource()
> along with the function it calls and let me know if your patch is
> needed.
> 
Thanks for your reply.
It seems is patch is not needed.
> >         scp->sram_base = devm_ioremap_resource(dev, res);
> >         if (IS_ERR((__force void *)scp->sram_base)) {
> >                 dev_err(dev, "Failed to parse and map sram
> > memory\n");
> > --
> > 2.37.3
> >