linux-kernel - Re: [PATCH 2/2] soc: fsl: guts: Add a missing memory allocation failure check

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Date:   Fri, 7 Jan 2022 10:40:43 +0800
From:   Li Yang <leoyang.li@....com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     tyreld@...ux.ibm.com, kernel-janitors@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/2] soc: fsl: guts: Add a missing memory allocation
 failure check

On Thu, Nov 4, 2021 at 4:10 AM Christophe JAILLET
<christophe.jaillet@...adoo.fr> wrote:
>
> If 'devm_kstrdup()' fails, we should return -ENOMEM.
>
> While at it, move the 'of_node_put()' call in the error handling path and
> after the 'machine' has been copied.
> Better safe than sorry.
>
> Suggested-by: Tyrel Datwyler <tyreld@...ux.ibm.com>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Applied with Fixes tag and Depends-on tag added.  Thanks.

> ---
> Not sure of which Fixes tag to add. Should be a6fc3b698130, but since
> another commit needs to be reverted for this patch to make sense, I'm
> unsure of what to do. :(
> So, none is given.
> ---
>  drivers/soc/fsl/guts.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/soc/fsl/guts.c b/drivers/soc/fsl/guts.c
> index af7741eafc57..5ed2fc1c53a0 100644
> --- a/drivers/soc/fsl/guts.c
> +++ b/drivers/soc/fsl/guts.c
> @@ -158,9 +158,14 @@ static int fsl_guts_probe(struct platform_device *pdev)
>         root = of_find_node_by_path("/");
>         if (of_property_read_string(root, "model", &machine))
>                 of_property_read_string_index(root, "compatible", 0, &machine);
> -       of_node_put(root);
> -       if (machine)
> +       if (machine) {
>                 soc_dev_attr.machine = devm_kstrdup(dev, machine, GFP_KERNEL);
> +               if (!soc_dev_attr.machine) {
> +                       of_node_put(root);
> +                       return -ENOMEM;
> +               }
> +       }
> +       of_node_put(root);
>
>         svr = fsl_guts_get_svr();
>         soc_die = fsl_soc_die_match(svr, fsl_soc_die);
> --
> 2.30.2
>