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

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Message-Id: <1283075566-27441-7-git-send-email-julia@diku.dk>
Date:	Sun, 29 Aug 2010 11:52:45 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	kernel-janitors@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org
Subject: [PATCH 6/7] arch/powerpc/platforms/maple/setup.c: Add of_node_put to avoid memory leak

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);
 		return -ENODEV;
 	}
 

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