linux-kernel - [PATCH 6/6] drivers/video/bfin-lq035q1-fb.c: introduce missing kfree

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Message-Id: <1301667827-20056-6-git-send-email-julia@diku.dk>
Date:	Fri,  1 Apr 2011 16:23:47 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	kernel-janitors@...r.kernel.org, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 6/6] drivers/video/bfin-lq035q1-fb.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/video/bfin-lq035q1-fb.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/video/bfin-lq035q1-fb.c b/drivers/video/bfin-lq035q1-fb.c
index c8e1f04..23b6c4b 100644
--- a/drivers/video/bfin-lq035q1-fb.c
+++ b/drivers/video/bfin-lq035q1-fb.c
@@ -154,8 +154,10 @@ static int __devinit lq035q1_spidev_probe(struct spi_device *spi)
 
 	ret = lq035q1_control(spi, LQ035_SHUT_CTL, LQ035_ON);
 	ret |= lq035q1_control(spi, LQ035_DRIVER_OUTPUT_CTL, ctl->mode);
-	if (ret)
+	if (ret) {
+		kfree(ctl);
 		return ret;
+	}
 
 	spi_set_drvdata(spi, ctl);
 

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