linux-kernel - Re: [PATCH] of: overlay: fix memory leak related to duplicated property

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Message-ID: <CAL_JsqJK2pEQOY68iin6MxLXiMnVHp6+SW17GNp=bWaoJ2RGbw@mail.gmail.com>
Date:   Fri, 13 Oct 2017 15:49:20 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Lixin Wang <alan.1.wang@...ia-sbell.com>
Cc:     Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Frank Rowand <frowand.list@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH] of: overlay: fix memory leak related to duplicated property

On Thu, Oct 12, 2017 at 10:07 PM, Lixin Wang
<alan.1.wang@...ia-sbell.com> wrote:
> From: alawang <alan.1.wang@...ia-sbell.com>
>
> Hello,
>
> Sorry It was my fault in last email that wrote the wrong subject and sign off name.
> Correct them this time.
> Thanks

This has to go below the '---' or it ends up in the commit message.
Please resend.

>
> Function of_changeset_add_property or of_changeset_update_property may
> fails. In this case the property just allocated is never deallocated.
>
> Signed-off-by: Lixin Wang <alan.1.wang@...ia-sbell.com>
> ---
>  drivers/of/overlay.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
> index 8ecfee3..af3b9a1 100644
> --- a/drivers/of/overlay.c
> +++ b/drivers/of/overlay.c
> @@ -162,6 +162,7 @@ static int of_overlay_apply_single_property(struct of_overlay *ov,
>                 bool is_symbols_node)
>  {
>         struct property *propn = NULL, *tprop;
> +       int ret = 0;
>
>         /* NOTE: Multiple changes of single properties not supported */
>         tprop = of_find_property(target, prop->name, NULL);
> @@ -186,10 +187,16 @@ static int of_overlay_apply_single_property(struct of_overlay *ov,
>
>         /* not found? add */
>         if (tprop == NULL)
> -               return of_changeset_add_property(&ov->cset, target, propn);
> -
> -       /* found? update */
> -       return of_changeset_update_property(&ov->cset, target, propn);
> +               ret = of_changeset_add_property(&ov->cset, target, propn);
> +       else /* found? update */
> +               ret = of_changeset_update_property(&ov->cset, target, propn);
> +
> +       if (ret) {
> +               kfree(propn->name);
> +               kfree(propn->value);
> +               kfree(propn);
> +       }
> +       return ret;
>  }
>
>  static int of_overlay_apply_single_device_node(struct of_overlay *ov,
> --
> 2.6.2
>
> --
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