linux-kernel - Re: [PATCH 6/7] arch/powerpc/platforms/maple/setup.c: Add of_node

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Date:	Wed, 8 Sep 2010 13:51:30 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Julia Lawall <julia@...u.dk>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	kernel-janitors@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 6/7] arch/powerpc/platforms/maple/setup.c: Add
 of_node_put to avoid memory leak

On Sun, Aug 29, 2010 at 11:52:45AM +0200, Julia Lawall wrote:
> Add a call to of_node_put in the error handling code following a call to
> of_find_node_by_path.
> 
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @r exists@
> local idexpression x;
> expression E,E1;
> statement S;
> @@
> 
> *x = 
> (of_find_node_by_path
> |of_find_node_by_name
> |of_find_node_by_phandle
> |of_get_parent
> |of_get_next_parent
> |of_get_next_child
> |of_find_compatible_node
> |of_match_node
> )(...);
> ...
> if (x == NULL) S
> <... when != x = E
> *if (...) {
>   ... when != of_node_put(x)
>       when != if (...) { ... of_node_put(x); ... }
> (
>   return <+...x...+>;
> |
> *  return ...;
> )
> }
> ...>
> of_node_put(x);
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  arch/powerpc/platforms/maple/setup.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/powerpc/platforms/maple/setup.c b/arch/powerpc/platforms/maple/setup.c
> index 3fff8d9..fe34c3d 100644
> --- a/arch/powerpc/platforms/maple/setup.c
> +++ b/arch/powerpc/platforms/maple/setup.c
> @@ -358,6 +358,7 @@ static int __init maple_cpc925_edac_setup(void)
>  	model = (const unsigned char *)of_get_property(np, "model", NULL);
>  	if (!model) {
>  		printk(KERN_ERR "%s: Unabel to get model info\n", __func__);
> +		of_node_put(np);

Acked-by: Grant Likely <grant.likely@...retlab.ca>

This patch should also fix the exact same problem after a call to
of_find_node_by_type() in the same function (line 370).

>  		return -ENODEV;
>  	}
>  
> 
--
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