From: Jean Delvare Date: Mon, 25 Aug 2008 10:49:20 +0000 (+0100) Subject: ALSA: ASoC: Fix double free and memory leak in many codec drivers X-Git-Tag: v2.6.27-rc5~37^2 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3051e41ab7daaa59d4564f20b25dcb8c03f35f2b;p=linux-2.6 ALSA: ASoC: Fix double free and memory leak in many codec drivers Many SoC audio codec drivers have improper freeing of memory in error paths. * codec is allocated in the platform device probe function, but is not freed there in case of error. Instead it is freed in the i2c device probe function's error path. However the success or failure of both functions is not linked, so this could result in a double free (if the platform device is successfully probed, the i2c device probing fails and then the platform driver is unregistered.) * codec->private_data is allocated in many platform device probe functions but not freed in their error paths. This patch hopefully solves all these problems. Signed-off-by: Jean Delvare Signed-off-by: Mark Brown Signed-off-by: Takashi Iwai --- diff --git a/sound/soc/codecs/ak4535.c b/sound/soc/codecs/ak4535.c index b26003c4f3..7da9f467b7 100644 --- a/sound/soc/codecs/ak4535.c +++ b/sound/soc/codecs/ak4535.c @@ -562,10 +562,9 @@ static int ak4535_codec_probe(struct i2c_adapter *adap, int addr, int kind) client_template.addr = addr; i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL); - if (i2c == NULL) { - kfree(codec); + if (i2c == NULL) return -ENOMEM; - } + i2c_set_clientdata(i2c, codec); codec->control_data = i2c; @@ -583,7 +582,6 @@ static int ak4535_codec_probe(struct i2c_adapter *adap, int addr, int kind) return ret; err: - kfree(codec); kfree(i2c); return ret; } @@ -660,6 +658,11 @@ static int ak4535_probe(struct platform_device *pdev) #else /* Add other interfaces here */ #endif + + if (ret != 0) { + kfree(codec->private_data); + kfree(codec); + } return ret; } diff --git a/sound/soc/codecs/tlv320aic3x.c b/sound/soc/codecs/tlv320aic3x.c index b1dce5f459..5f9abb1994 100644 --- a/sound/soc/codecs/tlv320aic3x.c +++ b/sound/soc/codecs/tlv320aic3x.c @@ -1199,10 +1199,9 @@ static int aic3x_codec_probe(struct i2c_adapter *adap, int addr, int kind) client_template.addr = addr; i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL); - if (i2c == NULL) { - kfree(codec); + if (i2c == NULL) return -ENOMEM; - } + i2c_set_clientdata(i2c, codec); codec->control_data = i2c; @@ -1221,7 +1220,6 @@ static int aic3x_codec_probe(struct i2c_adapter *adap, int addr, int kind) return ret; err: - kfree(codec); kfree(i2c); return ret; } @@ -1302,6 +1300,11 @@ static int aic3x_probe(struct platform_device *pdev) #else /* Add other interfaces here */ #endif + + if (ret != 0) { + kfree(codec->private_data); + kfree(codec); + } return ret; } diff --git a/sound/soc/codecs/uda1380.c b/sound/soc/codecs/uda1380.c index a52d6d9e00..807318fbdc 100644 --- a/sound/soc/codecs/uda1380.c +++ b/sound/soc/codecs/uda1380.c @@ -729,10 +729,9 @@ static int uda1380_codec_probe(struct i2c_adapter *adap, int addr, int kind) client_template.addr = addr; i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL); - if (i2c == NULL) { - kfree(codec); + if (i2c == NULL) return -ENOMEM; - } + i2c_set_clientdata(i2c, codec); codec->control_data = i2c; @@ -750,7 +749,6 @@ static int uda1380_codec_probe(struct i2c_adapter *adap, int addr, int kind) return ret; err: - kfree(codec); kfree(i2c); return ret; } @@ -817,6 +815,9 @@ static int uda1380_probe(struct platform_device *pdev) #else /* Add other interfaces here */ #endif + + if (ret != 0) + kfree(codec); return ret; } diff --git a/sound/soc/codecs/wm8510.c b/sound/soc/codecs/wm8510.c index 67325fd954..3d998e6a99 100644 --- a/sound/soc/codecs/wm8510.c +++ b/sound/soc/codecs/wm8510.c @@ -693,10 +693,9 @@ static int wm8510_codec_probe(struct i2c_adapter *adap, int addr, int kind) client_template.addr = addr; i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL); - if (i2c == NULL) { - kfree(codec); + if (i2c == NULL) return -ENOMEM; - } + i2c_set_clientdata(i2c, codec); codec->control_data = i2c; @@ -714,7 +713,6 @@ static int wm8510_codec_probe(struct i2c_adapter *adap, int addr, int kind) return ret; err: - kfree(codec); kfree(i2c); return ret; } @@ -782,6 +780,9 @@ static int wm8510_probe(struct platform_device *pdev) #else /* Add other interfaces here */ #endif + + if (ret != 0) + kfree(codec); return ret; } diff --git a/sound/soc/codecs/wm8731.c b/sound/soc/codecs/wm8731.c index 369d39c3f7..9402fcaf04 100644 --- a/sound/soc/codecs/wm8731.c +++ b/sound/soc/codecs/wm8731.c @@ -596,10 +596,9 @@ static int wm8731_codec_probe(struct i2c_adapter *adap, int addr, int kind) client_template.addr = addr; i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL); - if (i2c == NULL) { - kfree(codec); + if (i2c == NULL) return -ENOMEM; - } + i2c_set_clientdata(i2c, codec); codec->control_data = i2c; @@ -617,7 +616,6 @@ static int wm8731_codec_probe(struct i2c_adapter *adap, int addr, int kind) return ret; err: - kfree(codec); kfree(i2c); return ret; } @@ -693,6 +691,11 @@ static int wm8731_probe(struct platform_device *pdev) #else /* Add other interfaces here */ #endif + + if (ret != 0) { + kfree(codec->private_data); + kfree(codec); + } return ret; } diff --git a/sound/soc/codecs/wm8750.c b/sound/soc/codecs/wm8750.c index c6a8edf302..dd1f55404b 100644 --- a/sound/soc/codecs/wm8750.c +++ b/sound/soc/codecs/wm8750.c @@ -869,10 +869,9 @@ static int wm8750_codec_probe(struct i2c_adapter *adap, int addr, int kind) client_template.addr = addr; i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL); - if (i2c == NULL) { - kfree(codec); + if (i2c == NULL) return -ENOMEM; - } + i2c_set_clientdata(i2c, codec); codec->control_data = i2c; @@ -890,7 +889,6 @@ static int wm8750_codec_probe(struct i2c_adapter *adap, int addr, int kind) return ret; err: - kfree(codec); kfree(i2c); return ret; } @@ -966,6 +964,10 @@ static int wm8750_probe(struct platform_device *pdev) /* Add other interfaces here */ #endif + if (ret != 0) { + kfree(codec->private_data); + kfree(codec); + } return ret; } diff --git a/sound/soc/codecs/wm8753.c b/sound/soc/codecs/wm8753.c index 8604809f0c..35bf1c3698 100644 --- a/sound/soc/codecs/wm8753.c +++ b/sound/soc/codecs/wm8753.c @@ -1661,10 +1661,9 @@ static int wm8753_codec_probe(struct i2c_adapter *adap, int addr, int kind) client_template.addr = addr; i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL); - if (!i2c) { - kfree(codec); + if (!i2c) return -ENOMEM; - } + i2c_set_clientdata(i2c, codec); codec->control_data = i2c; @@ -1683,7 +1682,6 @@ static int wm8753_codec_probe(struct i2c_adapter *adap, int addr, int kind) return ret; err: - kfree(codec); kfree(i2c); return ret; } @@ -1760,6 +1758,11 @@ static int wm8753_probe(struct platform_device *pdev) #else /* Add other interfaces here */ #endif + + if (ret != 0) { + kfree(codec->private_data); + kfree(codec); + } return ret; } diff --git a/sound/soc/codecs/wm8990.c b/sound/soc/codecs/wm8990.c index e44153fa38..dd995ef448 100644 --- a/sound/soc/codecs/wm8990.c +++ b/sound/soc/codecs/wm8990.c @@ -1500,10 +1500,9 @@ static int wm8990_codec_probe(struct i2c_adapter *adap, int addr, int kind) client_template.addr = addr; i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL); - if (i2c == NULL) { - kfree(codec); + if (i2c == NULL) return -ENOMEM; - } + i2c_set_clientdata(i2c, codec); codec->control_data = i2c; @@ -1521,7 +1520,6 @@ static int wm8990_codec_probe(struct i2c_adapter *adap, int addr, int kind) return ret; err: - kfree(codec); kfree(i2c); return ret; } @@ -1595,6 +1593,11 @@ static int wm8990_probe(struct platform_device *pdev) #else /* Add other interfaces here */ #endif + + if (ret != 0) { + kfree(codec->private_data); + kfree(codec); + } return ret; }