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SubjectRe: [PATCH 4/7] arch/powerpc/platforms/powermac/pfunc_core.c: Add of_node_put to avoid memory leak
[cc'ing linuxppc-dev]

On Sun, Aug 29, 2010 at 11:52:43AM +0200, Julia Lawall wrote:
> Add a call to of_node_put in the error handling code following a call to
> of_find_node_by_phandle.
>
> 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@diku.dk>

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

>
> ---
> arch/powerpc/platforms/powermac/pfunc_core.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/platforms/powermac/pfunc_core.c b/arch/powerpc/platforms/powermac/pfunc_core.c
> index cec6359..b0c3777 100644
> --- a/arch/powerpc/platforms/powermac/pfunc_core.c
> +++ b/arch/powerpc/platforms/powermac/pfunc_core.c
> @@ -837,8 +837,10 @@ struct pmf_function *__pmf_find_function(struct device_node *target,
> return NULL;
> find_it:
> dev = pmf_find_device(actor);
> - if (dev == NULL)
> - return NULL;
> + if (dev == NULL) {
> + result = NULL;
> + goto out;
> + }
>
> list_for_each_entry(func, &dev->functions, link) {
> if (name && strcmp(name, func->name))
> @@ -850,8 +852,9 @@ struct pmf_function *__pmf_find_function(struct device_node *target,
> result = func;
> break;
> }
> - of_node_put(actor);
> pmf_put_device(dev);
> +out:
> + of_node_put(actor);
> return result;
> }
>
>


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