[PATCH v2 11/12] wm8978: fix a memory leak if a wm8978_register fail

Axel Lin
2010-07-23T05:54:57Z

There is a memory leak found if wm8978_register() fail.
This patch moves the buffer allocate and release
at the same level to prevent the memory leak.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Reviewed-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
---
sound/soc/codecs/wm8978.c | 10 +++++++---
1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/wm8978.c b/sound/soc/codecs/wm8978.c
index 51d5f43..8a1ad77 100644
--- a/sound/soc/codecs/wm8978.c
+++ b/sound/soc/codecs/wm8978.c
@@ -1076,7 +1076,6 @@ static __devinit int wm8978_register(struct wm8978_priv *wm8978)
err_codec:
snd_soc_unregister_codec(codec);
err:
- kfree(wm8978);
return ret;
}

@@ -1085,13 +1084,13 @@ static __devexit void wm8978_unregister(struct wm8978_priv *wm8978)
wm8978_set_bias_level(&wm8978->codec, SND_SOC_BIAS_OFF);
snd_soc_unregister_dai(&wm8978_dai);
snd_soc_unregister_codec(&wm8978->codec);
- kfree(wm8978);
wm8978_codec = NULL;
}

static __devinit int wm8978_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
+ int ret;
struct wm8978_priv *wm8978;
struct snd_soc_codec *codec;

@@ -1107,13 +1106,18 @@ static __devinit int wm8978_i2c_probe(struct i2c_client *i2c,

codec->dev = &i2c->dev;

- return wm8978_register(wm8978);
+ ret = wm8978_register(wm8978);
+ if (ret < 0)
+ kfree(wm8978);
+
+ return ret;
}

static __devexit int wm8978_i2c_remove(struct i2c_client *client)
{
struct wm8978_priv *wm8978 = i2c_get_clientdata(client);
wm8978_unregister(wm8978);
+ kfree(wm8978);
return 0;
}

--
1.7.0.4