[PATCH 3/7] drivers/mtd/nand/mpc5121_nfc.c: Add of_node_put to avoid memory leak

[PATCH 3/7] drivers/mtd/nand/mpc5121_nfc.c: Add of_node_put to avoid memory leak

[Julia Lawall]

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@diku.dk>

---
 drivers/mtd/nand/mpc5121_nfc.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/mpc5121_nfc.c b/drivers/mtd/nand/mpc5121_nfc.c
index df0c1da..f4610bc 100644
--- a/drivers/mtd/nand/mpc5121_nfc.c
+++ b/drivers/mtd/nand/mpc5121_nfc.c
@@ -568,6 +568,7 @@ static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd)
 	uint rcw_width;
 	uint rcwh;
 	uint romloc, ps;
+	int ret = 0;
 
 	rmnode = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-reset");
 	if (!rmnode) {
@@ -579,7 +580,8 @@ static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd)
 	rm = of_iomap(rmnode, 0);
 	if (!rm) {
 		dev_err(prv->dev, "Error mapping reset module node!\n");
-		return -EBUSY;
+		ret = -EBUSY;
+		goto out;
 	}
 
 	rcwh = in_be32(&rm->rcwhr);
@@ -628,8 +630,9 @@ static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd)
 				rcw_width * 8, rcw_pagesize,
 				rcw_sparesize);
 	iounmap(rm);
+out:
 	of_node_put(rmnode);
-	return 0;
+	return ret;
 }
 
 /* Free driver resources */

Re: [PATCH 3/7] drivers/mtd/nand/mpc5121_nfc.c: Add of_node_put to avoid memory leak

[Wolfram Sang]

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On Sun, Aug 29, 2010 at 11:52:42AM +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@diku.dk>

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

adding ppc-list to cc.

> 
> ---
>  drivers/mtd/nand/mpc5121_nfc.c |    7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/nand/mpc5121_nfc.c b/drivers/mtd/nand/mpc5121_nfc.c
> index df0c1da..f4610bc 100644
> --- a/drivers/mtd/nand/mpc5121_nfc.c
> +++ b/drivers/mtd/nand/mpc5121_nfc.c
> @@ -568,6 +568,7 @@ static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd)
>  	uint rcw_width;
>  	uint rcwh;
>  	uint romloc, ps;
> +	int ret = 0;
>  
>  	rmnode = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-reset");
>  	if (!rmnode) {
> @@ -579,7 +580,8 @@ static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd)
>  	rm = of_iomap(rmnode, 0);
>  	if (!rm) {
>  		dev_err(prv->dev, "Error mapping reset module node!\n");
> -		return -EBUSY;
> +		ret = -EBUSY;
> +		goto out;
>  	}
>  
>  	rcwh = in_be32(&rm->rcwhr);
> @@ -628,8 +630,9 @@ static int mpc5121_nfc_read_hw_config(struct mtd_info *mtd)
>  				rcw_width * 8, rcw_pagesize,
>  				rcw_sparesize);
>  	iounmap(rm);
> +out:
>  	of_node_put(rmnode);
> -	return 0;
> +	return ret;
>  }
>  
>  /* Free driver resources */
> 
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: [PATCH 3/7] drivers/mtd/nand/mpc5121_nfc.c: Add of_node_put to avoid memory leak

[Artem Bityutskiy]

On Sun, 2010-08-29 at 11:52 +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/)

Pushed to l2-mtd-2.6.git / master, thanks.

-- 
Best Regards,
Artem Bityutskiy (Битюцкий Артём)