linux-kernel - Re: [PATCH] drm/imx: fix memory leak in imx_pd

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Date:   Sat, 5 Oct 2019 17:02:58 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Navid Emamdoost <navid.emamdoost@...il.com>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
        kernel@...gutronix.de
Cc:     Navid Emamdoost <emamd001@....edu>, Kangjie Lu <kjlu@....edu>,
        Stephen McCamant <smccaman@....edu>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Fabio Estevam <festevam@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] drm/imx: fix memory leak in imx_pd_bind

> 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 = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
> -	if (ret && ret != -ENODEV)
> +	if (ret && ret != -ENODEV) {
> +		kfree(imxpd->edid);
>  		return ret;
> +	}
>
>  	imxpd->dev = dev;

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

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

…

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


Regards,
Markus