[ALSA] sound: snd_register_device_for_dev fix

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@tuxland.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 8 insertions, 0 deletions

diff --git a/sound/core/sound.c b/sound/core/sound.c
index 8dc7a3b32b98..f6ebce08b537 100644
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -266,6 +266,14 @@ int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
         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);