linux-kernel - Re: [PATCH] remoteproc: imx_rproc: Fix refcount leak in imx_rproc_addr

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Date:   Wed, 22 Jun 2022 10:48:10 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Peng Fan <peng.fan@....com>,
        Oleksij Rempel <linux@...pel-privat.de>,
        linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] remoteproc: imx_rproc: Fix refcount leak in
 imx_rproc_addr_init

On Thu, May 12, 2022 at 08:55:58AM +0400, Miaoqian Lin wrote:
> of_parse_phandle() returns a node pointer with refcount
> incremented, we should use of_node_put() on it when not needed anymore.
> This function has two paths missing of_node_put().
> 
> Fixes: 6e962bfe56b9 ("remoteproc: imx_rproc: add missing of_node_put")
> Fixes: a0ff4aa6f010 ("remoteproc: imx_rproc: add a NXP/Freescale imx_rproc driver")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
>  drivers/remoteproc/imx_rproc.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
> index 7a096f1891e6..6363ed40854a 100644
> --- a/drivers/remoteproc/imx_rproc.c
> +++ b/drivers/remoteproc/imx_rproc.c
> @@ -559,16 +559,17 @@ static int imx_rproc_addr_init(struct imx_rproc *priv,
>  
>  		node = of_parse_phandle(np, "memory-region", a);
>  		/* Not map vdevbuffer, vdevring region */
> -		if (!strncmp(node->name, "vdev", strlen("vdev")))
> +		if (!strncmp(node->name, "vdev", strlen("vdev"))) {
> +			of_node_put(node);
>  			continue;
> +		}
>  		err = of_address_to_resource(node, 0, &res);
> +		of_node_put(node);

Applied.

Thanks,
Mathieu

>  		if (err) {
>  			dev_err(dev, "unable to resolve memory region\n");
>  			return err;
>  		}
>  
> -		of_node_put(node);
> -
>  		if (b >= IMX_RPROC_MEM_MAX)
>  			break;
>  
> -- 
> 2.25.1
>