linux-kernel - Re: [PATCH 5/5] sound/aoa: Add kmalloc NULL tests

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Date:	Fri, 31 Jul 2009 08:32:03 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Johannes Berg <johannes@...solutions.net>, linuxppc-dev@...abs.org,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 5/5] sound/aoa: Add kmalloc NULL tests

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

Check that the result of kzalloc is not NULL before a dereference.

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

// <smpl>
@@
expression *x;
identifier f;
constant char *C;
@@

x = \(kmalloc\|kcalloc\|kzalloc\)(...);
... when != x == NULL
    when != x != NULL
    when != (x || ...)
(
kfree(x)
|
f(...,C,...,x,...)
|
*f(...,x,...)
|
*x->f
)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 sound/aoa/core/gpio-pmf.c           |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/var/linuxes/linux-next/sound/aoa/core/gpio-pmf.c b/var/julia/linuxcopy/sound/aoa/core/gpio-pmf.c
index 5ca2220..1dd0c28 100644
--- a/var/linuxes/linux-next/sound/aoa/core/gpio-pmf.c
+++ b/var/julia/linuxcopy/sound/aoa/core/gpio-pmf.c
@@ -182,6 +182,10 @@ static int pmf_set_notify(struct gpio_runtime *rt,
 	if (!old && notify) {
 		irq_client = kzalloc(sizeof(struct pmf_irq_client),
 				     GFP_KERNEL);
+		if (!irq_client) {
+			err = -ENOMEM;
+			goto out_unlock;
+		}
 		irq_client->data = notif;
 		irq_client->handler = pmf_handle_notify_irq;
 		irq_client->owner = THIS_MODULE;
--
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