linux-kernel - Re: [PATCH 5/7] arch/powerpc/sysdev/qe_lib/qe.c: Add of_node

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Date:	Tue, 31 Aug 2010 16:41:24 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Julia Lawall <julia@...u.dk>
Cc:	Timur Tabi <timur@...escale.com>,
	devicetree-discuss@...ts.ozlabs.org,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 5/7] arch/powerpc/sysdev/qe_lib/qe.c: Add of_node_put to avoid memory leak


On Aug 29, 2010, at 4:52 AM, Julia Lawall wrote:

> Add a call to of_node_put in the error handling code following a call to
> of_find_compatible_node.
> 
> 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/sysdev/qe_lib/qe.c |    1 +
> 1 file changed, 1 insertion(+)

applied to merge

- k
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