linux-kernel - Re: [PATCH 2/7] drivers/serial/mpc52xx_uart.c: Add of_node

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Message-ID: <20100829154208.GA4647@pengutronix.de>
Date:	Sun, 29 Aug 2010 17:42:08 +0200
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Julia Lawall <julia@...u.dk>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 2/7] drivers/serial/mpc52xx_uart.c: Add of_node_put to
	avoid memory leak

On Sun, Aug 29, 2010 at 11:52:41AM +0200, 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>

Acked-by: Wolfram Sang <w.sang@...gutronix.de>

adding ppc-list to CC.

> 
> ---
>  drivers/serial/mpc52xx_uart.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c
> index 8dedb26..c4399e2 100644
> --- a/drivers/serial/mpc52xx_uart.c
> +++ b/drivers/serial/mpc52xx_uart.c
> @@ -500,6 +500,7 @@ static int __init mpc512x_psc_fifoc_init(void)
>  	psc_fifoc = of_iomap(np, 0);
>  	if (!psc_fifoc) {
>  		pr_err("%s: Can't map FIFOC\n", __func__);
> +		of_node_put(np);
>  		return -ENODEV;
>  	}
>  
> 
> --
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-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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