linux-kernel - [PATCH 4/8] drivers/edac: introduce missing kfree

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Message-ID: <Pine.LNX.4.64.0911211250370.23681@ask.diku.dk>
Date:	Sat, 21 Nov 2009 12:51:02 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	dougthompson@...ssion.com, bluesmoke-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 4/8] drivers/edac: introduce missing kfree

From: Julia Lawall <julia@...u.dk>

Error handling code following a kzalloc should free the allocated data.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
statement S;
expression E;
identifier f,f1,l;
position p1,p2;
expression *ptr != NULL;
@@

x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
<... when != x
     when != if (...) { <+...x...+> }
(
x->f1 = E
|
 (x->f1 == NULL || ...)
|
 f(...,x->f1,...)
)
...>
(
 return \(0\|<+...x...+>\|ptr\);
|
 return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>
---
 drivers/edac/i7core_edac.c          |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
index e944b63..4de5a18 100644
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -1215,8 +1215,10 @@ int i7core_get_onedevice(struct pci_dev **prev, int devno,
 			return -ENOMEM;
 		i7core_dev->pdev = kzalloc(sizeof(*i7core_dev->pdev) * n_devs,
 					   GFP_KERNEL);
-		if (!i7core_dev->pdev)
+		if (!i7core_dev->pdev) {
+			kfree(i7core_dev);
 			return -ENOMEM;
+		}
 		i7core_dev->socket = socket;
 		i7core_dev->n_devs = n_devs;
 		list_add_tail(&i7core_dev->list, &i7core_edac_list);
--
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