linux-kernel - Re: [PATCH] dmaengine: ti: Fix a memory leak bug

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Date:   Fri, 16 Aug 2019 02:45:29 -0400
From:   Wenwen Wang <wenwen@...uga.edu>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vkoul@...nel.org>, Enrico Weigelt <info@...ux.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        "open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM" 
        <dmaengine@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Wenwen Wang <wenwen@...uga.edu>
Subject: Re: [PATCH] dmaengine: ti: Fix a memory leak bug

On Fri, Aug 16, 2019 at 2:42 AM Peter Ujfalusi <peter.ujfalusi@...com> wrote:
>
>
>
> On 16/08/2019 9.23, Wenwen Wang wrote:
> > In ti_dra7_xbar_probe(), 'rsv_events' is allocated through kcalloc(). Then
> > of_property_read_u32_array() is invoked to search for the property.
> > However, if this process fails, 'rsv_events' is not deallocated, leading to
> > a memory leak bug. To fix this issue, free 'rsv_events' before returning
> > the error.
>
> Can you change the subject to:
> "dmaengine: ti: dma-crossbar: Fix a memory leak bug" ?

No problem. I will rework the patch. Thanks for your suggestion!

Wenwen

>
> Otherwise: Thank you, and
> Acked-by: Peter Ujfalusi <peter.ujfalusi@...com>
>
> >
> > Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
> > ---
> >  drivers/dma/ti/dma-crossbar.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/dma/ti/dma-crossbar.c b/drivers/dma/ti/dma-crossbar.c
> > index ad2f0a4..f255056 100644
> > --- a/drivers/dma/ti/dma-crossbar.c
> > +++ b/drivers/dma/ti/dma-crossbar.c
> > @@ -391,8 +391,10 @@ static int ti_dra7_xbar_probe(struct platform_device *pdev)
> >
> >               ret = of_property_read_u32_array(node, pname, (u32 *)rsv_events,
> >                                                nelm * 2);
> > -             if (ret)
> > +             if (ret) {
> > +                     kfree(rsv_events);
> >                       return ret;
> > +             }
> >
> >               for (i = 0; i < nelm; i++) {
> >                       ti_dra7_xbar_reserve(rsv_events[i][0], rsv_events[i][1],
> >
>
> - Péter
>
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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