linux-kernel - [PATCH] sound: snd_register_device_for

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Message-Id: <200709270954.57707.m.kozlowski@tuxland.pl>
Date:	Thu, 27 Sep 2007 09:54:57 +0200
From:	Mariusz Kozlowski <m.kozlowski@...land.pl>
To:	perex@...e.cz
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] sound: snd_register_device_for_dev fix

Now snd_register_device_for_dev() can oops when device_create() returns ERR_PTR(err).

Scenario:

preg->dev = device_create(...); /* fails */
if (preg->dev) /* contains ERR_PTR(err) */
	dev_set_drvdata(preg->dev, private_data);

and dev_set_drvdata() looks like this:

static inline void
dev_set_drvdata (struct device *dev, void *data)
{
	dev->driver_data = data; <--- boom
}

This patch should prevent that.

Signed-off-by: Mariusz Kozlowski <m.kozlowski@...land.pl>

 sound/core/sound.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- linux-2.6.23-rc8-mm1-a/sound/core/sound.c	2007-09-26 12:07:01.000000000 +0200
+++ linux-2.6.23-rc8-mm1-b/sound/core/sound.c	2007-09-27 09:36:47.000000000 +0200
@@ -266,6 +266,14 @@ int snd_register_device_for_dev(int type
 	snd_minors[minor] = preg;
 	preg->dev = device_create(sound_class, device, MKDEV(major, minor),
 				  "%s", name);
+	if (IS_ERR(preg->dev)) {
+		snd_minors[minor] = NULL;
+		mutex_unlock(&sound_mutex);
+		minor = PTR_ERR(preg->dev);
+		kfree(preg);
+		return minor;
+	}
+
 	if (preg->dev)
 		dev_set_drvdata(preg->dev, private_data);

-
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