linux-kernel - Re: [PATCH] v4l: xilinx-vipp: Fix refcount leak in xvip_graph_dma

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Message-ID: <YpcWf46fAJcfIgIt@pendragon.ideasonboard.com>
Date:   Wed, 1 Jun 2022 10:34:23 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Hyun Kwon <hyun.kwon@...inx.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        Radhey Shyam Pandey <radheys@...inx.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] v4l: xilinx-vipp: Fix refcount leak in
 xvip_graph_dma_init

Hi Lin,

Thank you for the patch.

On Wed, Jun 01, 2022 at 08:25:14AM +0400, Miaoqian Lin wrote:
> of_get_child_by_name() returns a node pointer with refcount
> incremented, we should use of_node_put() on it when not need anymore.
> Add missing of_node_put() to avoid refcount leak.
> 
> Fixes: df3305156f98 ("[media] v4l: xilinx: Add Xilinx Video IP core")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
>  drivers/media/platform/xilinx/xilinx-vipp.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/media/platform/xilinx/xilinx-vipp.c b/drivers/media/platform/xilinx/xilinx-vipp.c
> index f34f8b077e03..415579b63737 100644
> --- a/drivers/media/platform/xilinx/xilinx-vipp.c
> +++ b/drivers/media/platform/xilinx/xilinx-vipp.c
> @@ -483,10 +483,12 @@ static int xvip_graph_dma_init(struct xvip_composite_device *xdev)
>  		ret = xvip_graph_dma_init_one(xdev, port);
>  		if (ret < 0) {
>  			of_node_put(port);
> +			of_node_put(ports);
>  			return ret;
>  		}
>  	}
>  
> +	of_node_put(ports);

We could possibly simplify this a little bit by initializing ret to 0
when declaring it, replacing the "return ret" above by a break, and
returning ret below. This would remove the need for the first
of_node_put(ports) call above.

If you think that's a good idea I can make that change when applying
this patch to my tree, otherwise I'll take it as-is.

In either case,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

>  	return 0;
>  }
>  

-- 
Regards,

Laurent Pinchart