linux-kernel - Re: [PATCH 1/8] arch/mips/txx9: introduce missing kfree, iounmap

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Message-ID: <Pine.LNX.4.64.0909151755280.8549@pc-004.diku.dk>
Date:	Tue, 15 Sep 2009 17:56:14 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:	ralf@...ux-mips.org, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/8] arch/mips/txx9: introduce missing kfree, iounmap

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

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

The semantic match that finds the first 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>
---
 arch/mips/txx9/generic/setup.c      |   18 ++++++++++++++----
 1 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/arch/mips/txx9/generic/setup.c b/arch/mips/txx9/generic/setup.c
index a205e2b..dfe4720 100644
--- a/arch/mips/txx9/generic/setup.c
+++ b/arch/mips/txx9/generic/setup.c
@@ -782,7 +782,7 @@ void __init txx9_iocled_init(unsigned long baseaddr,
 		return;
 	iocled->mmioaddr = ioremap(baseaddr, 1);
 	if (!iocled->mmioaddr)
-		return;
+		goto out_free;
 	iocled->chip.get = txx9_iocled_get;
 	iocled->chip.set = txx9_iocled_set;
 	iocled->chip.direction_input = txx9_iocled_dir_in;
@@ -791,13 +791,13 @@ void __init txx9_iocled_init(unsigned long baseaddr,
 	iocled->chip.base = basenum;
 	iocled->chip.ngpio = num;
 	if (gpiochip_add(&iocled->chip))
-		return;
+		goto out_unmap;
 	if (basenum < 0)
 		basenum = iocled->chip.base;
 
 	pdev = platform_device_alloc("leds-gpio", basenum);
 	if (!pdev)
-		return;
+		goto out_gpio;
 	iocled->pdata.num_leds = num;
 	iocled->pdata.leds = iocled->leds;
 	for (i = 0; i < num; i++) {
@@ -812,7 +812,17 @@ void __init txx9_iocled_init(unsigned long baseaddr,
 	}
 	pdev->dev.platform_data = &iocled->pdata;
 	if (platform_device_add(pdev))
-		platform_device_put(pdev);
+		goto out_pdev;
+	return;
+out_pdev:
+	platform_device_put(pdev);
+out_gpio:
+	if (gpiochip_remove(&iocled->chip))
+		return;
+out_unmap:
+	iounmap(iocled->mmioaddr);
+out_free:
+	kfree(iocled);
 }
 #else /* CONFIG_LEDS_GPIO */
 void __init txx9_iocled_init(unsigned long baseaddr,
--
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