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 <khali@linux-fr.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

8 files changed, 51 insertions, 32 deletions

diff --git a/sound/soc/codecs/ak4535.c b/sound/soc/codecs/ak4535.c
index b26003c4f3e..7da9f467b7b 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 b1dce5f459d..5f9abb19943 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 a52d6d9e007..807318fbdc8 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 67325fd9544..3d998e6a997 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 369d39c3f74..9402fcaf04f 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 c6a8edf302a..dd1f55404b2 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 8604809f0c3..35bf1c36987 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 e44153fa38d..dd995ef448b 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;
 }