linux-kernel - [PATCH 3/6] drivers/staging/cx25821/cx25821-video.c: introduce missing kfree

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Message-Id: <1301667827-20056-3-git-send-email-julia@diku.dk>
Date:	Fri,  1 Apr 2011 16:23:44 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	kernel-janitors@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Hans Verkuil <hverkuil@...all.nl>,
	Palash Bandyopadhyay <palash.bandyopadhyay@...exant.com>,
	Andreas Bombe <aeb@...ian.org>, Joe Perches <joe@...ches.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/6] drivers/staging/cx25821/cx25821-video.c: introduce missing kfree

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

The semantic match that finds the 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/staging/cx25821/cx25821-video.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/cx25821/cx25821-video.c b/drivers/staging/cx25821/cx25821-video.c
index ab05392..04b18f4 100644
--- a/drivers/staging/cx25821/cx25821-video.c
+++ b/drivers/staging/cx25821/cx25821-video.c
@@ -832,6 +832,7 @@ static int video_open(struct file *file)
 
        if (NULL == dev) {
 		mutex_unlock(&cx25821_devlist_mutex);
+		kfree(fh);
 		return -ENODEV;
        }
 

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