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Cc:     Navid Emamdoost <emamd001@umn.edu>, Kangjie Lu <kjlu@umn.edu>,
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References: <20191004190938.15353-1-navid.emamdoost@gmail.com>
Subject: Re: [PATCH] drm/imx: fix memory leak in imx_pd_bind
From:   Markus Elfring <Markus.Elfring@web.de>
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To:     Navid Emamdoost <navid.emamdoost@gmail.com>,
        dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org, linux-imx@nxp.com,
        kernel@pengutronix.de
Message-ID: <027fde47-86b3-35c8-85e6-ea7c191e772c@web.de>
Date:   Sat, 5 Oct 2019 17:02:58 +0200
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

> In imx_pd_bind, the duplicated memory for imxpd->edid via kmemdup should
> be released in drm_of_find_panel_or_bridge or imx_pd_register fail.

Please improve this change description.


> +++ b/drivers/gpu/drm/imx/parallel-display.c
> @@ -227,14 +227,18 @@ static int imx_pd_bind(struct device *dev, struct =
device *master, void *data)
>
>  	/* port@1 is the output port */
>  	ret =3D drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->b=
ridge);
> -	if (ret && ret !=3D -ENODEV)
> +	if (ret && ret !=3D -ENODEV) {
> +		kfree(imxpd->edid);
>  		return ret;
> +	}
>
>  	imxpd->dev =3D dev;

Please use a jump target here instead of adding duplicate source code
for the completion of exception handling.

 	if (ret && ret !=3D -ENODEV)
-		return ret;
+		goto free_edid;

=E2=80=A6

+free_edid:
+ 	kfree(imxpd->edid);
+ 	return ret;


Regards,
Markus