linux-kernel - Re: [PATCH] drm/nouveau/clk/gm20b: Fix memory leak in gm20b_clk_new

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Date:   Mon, 1 Jun 2020 07:26:53 +1000
From:   Ben Skeggs <skeggsb@...il.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu, David Airlie <airlied@...ux.ie>,
        ML nouveau <nouveau@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        Ben Skeggs <bskeggs@...hat.com>
Subject: Re: [PATCH] drm/nouveau/clk/gm20b: Fix memory leak in gm20b_clk_new

On Sat, 30 May 2020 at 19:42, Dinghao Liu <dinghao.liu@....edu.cn> wrote:
>
> When gk20a_clk_ctor() returns an error code, pointer "clk"
> should be released. It's the same when gm20b_clk_new()
> returns from elsewhere following this call.
This shouldn't be necessary.  If a subdev constructor fails, and
returns a pointer, the core will call the destructor to clean things
up.

Ben.

>
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/gpu/drm/nouveau/nvkm/subdev/clk/gm20b.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gm20b.c b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gm20b.c
> index b284e949f732..a5aeba74d3b7 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gm20b.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/gm20b.c
> @@ -1039,7 +1039,7 @@ gm20b_clk_new(struct nvkm_device *device, int index, struct nvkm_clk **pclk)
>         ret = gk20a_clk_ctor(device, index, &gm20b_clk, clk_params,
>                              &clk->base);
>         if (ret)
> -               return ret;
> +               goto out_free;
>
>         /*
>          * NAPLL can only work with max_u, clamp the m range so
> @@ -1067,8 +1067,8 @@ gm20b_clk_new(struct nvkm_device *device, int index, struct nvkm_clk **pclk)
>                 nvkm_warn(subdev, "no fused calibration parameters\n");
>
>         ret = gm20b_clk_init_safe_fmax(clk);
> -       if (ret)
> -               return ret;
>
> -       return 0;
> +out_free:
> +       kfree(clk);
> +       return ret;
>  }
> --
> 2.17.1
>
> _______________________________________________
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> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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