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 <[email protected]>
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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