[PATCH] pcm030-audio-fabric: Fix a memory leaking bug in pcm030_fabric_probe()

[Gen Zhang]

In pcm030_fabric_probe(), 'pdata->codec_device' is allocated by
platform_device_alloc(). When this allocation fails, ENOMEM is returned.
However, 'pdata' is allocated by devm_kzalloc() before this site. We
should free 'pdata' before function ends to prevent memory leaking.

Similarly, we should free 'pdata' when 'pdata->codec_device' is NULL.
And we should free 'pdata->codec_device' and 'pdata' when 'ret' is error
to prevent memory leaking.

Signed-off-by: Gen Zhang <blackgod016...@gmail.com>
---
diff --git a/sound/soc/fsl/pcm030-audio-fabric.c 
b/sound/soc/fsl/pcm030-audio-fabric.c
index a7fe4ad..d2e6eae 100644
--- a/sound/soc/fsl/pcm030-audio-fabric.c
+++ b/sound/soc/fsl/pcm030-audio-fabric.c
@@ -72,29 +72,43 @@ static int pcm030_fabric_probe(struct platform_device *op)
        platform_np = of_parse_phandle(np, "asoc-platform", 0);
        if (!platform_np) {
                dev_err(&op->dev, "ac97 not registered\n");
-               return -ENODEV;
+               ret = -ENODEV;
+               goto out_free1;
        }
 
        for_each_card_prelinks(card, i, dai_link)
                dai_link->platform_of_node = platform_np;
 
        ret = request_module("snd-soc-wm9712");
-       if (ret)
+       if (ret) {
                dev_err(&op->dev, "request_module returned: %d\n", ret);
+               goto out_free1;
+       }
 
        pdata->codec_device = platform_device_alloc("wm9712-codec", -1);
-       if (!pdata->codec_device)
+       if (!pdata->codec_device) {
                dev_err(&op->dev, "platform_device_alloc() failed\n");
+               ret = -ENOMEM;
+               goto out_free1;
+       }
 
        ret = platform_device_add(pdata->codec_device);
-       if (ret)
+       if (ret) {
                dev_err(&op->dev, "platform_device_add() failed: %d\n", ret);
+               goto out_free2;
+       }
 
        ret = snd_soc_register_card(card);
-       if (ret)
+       if (ret) {
                dev_err(&op->dev, "snd_soc_register_card() failed: %d\n", ret);
+               goto out_free2;
+       }
 
        platform_set_drvdata(op, pdata);
+out_free2:
+       platform_device_put(pdata->codec_device);
+out_free1:
+       devm_kfree(&op->dev, pdata);
 
        return ret;
 }
---