linux-kernel - Re: [PATCH] media: v4l2-core: Fix a potential resource leak in v4l2_fwnode_parse

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Date:   Tue, 13 Jun 2023 10:55:10 +0000
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-media@...r.kernel.org
Subject: Re: [PATCH] media: v4l2-core: Fix a potential resource leak in
 v4l2_fwnode_parse_link()

Hi Christophe,

On Mon, May 29, 2023 at 08:17:18AM +0200, Christophe JAILLET wrote:
> 'fwnode is known to be NULL, at this point, so fwnode_handle_put() is a
> no-op.
> 
> Release the reference taken from a previous fwnode_graph_get_port_parent()
> call instead.
> 
> Fixes: ca50c197bd96 ("[media] v4l: fwnode: Support generic fwnode for parsing standardised properties")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> /!\  THIS PATCH IS SPECULATIVE  /!\
>          review with care
> ---
>  drivers/media/v4l2-core/v4l2-fwnode.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
> index 049c2f2001ea..b7dd467c53fd 100644
> --- a/drivers/media/v4l2-core/v4l2-fwnode.c
> +++ b/drivers/media/v4l2-core/v4l2-fwnode.c
> @@ -571,7 +571,7 @@ int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode,
>  
>  	fwnode = fwnode_graph_get_remote_endpoint(fwnode);
>  	if (!fwnode) {
> -		fwnode_handle_put(fwnode);
> +		fwnode_handle_put(link->local_node);

link->local_node also needs to be non-NULL for the successful case. The
condition should take that into account. Could you send v2 with that?

>  		return -ENOLINK;
>  	}
>  

-- 
Kind regards,

Sakari Ailus