ASoC: amd: Fix potential NULL pointer dereference

Check return value from call to devm_kzalloc() in order to prevent a
potential NULL pointer dereference.

Also, notice that it makes no sense to allocate any resources if
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); fails,
so move the call to devm_kzalloc() below the mentioned code.

Lastly, improve the use of sizeof in the call to devm_kzalloc() by
changing it from sizeof(struct i2s_dev_data) to sizeof(*adata)

This issue was detected with the help of Coccinelle.

Fixes: ac289c7ec0bc ("ASoC: amd: add ACP3x PCM platform driver")
Cc: stable@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/amd/raven/acp3x-pcm-dma.c b/sound/soc/amd/raven/acp3x-pcm-dma.c
index 022a8912c8a2554eaec61b712fd9f83e474fd6dc..3d58338fa3cf79b3d9c28351cfd9411167fe51a5 100644 (file)
--- a/sound/soc/amd/raven/acp3x-pcm-dma.c
+++ b/sound/soc/amd/raven/acp3x-pcm-dma.c
@@ -611,14 +611,16 @@ static int acp3x_audio_probe(struct platform_device *pdev)
        }
        irqflags = *((unsigned int *)(pdev->dev.platform_data));
 
-       adata = devm_kzalloc(&pdev->dev, sizeof(struct i2s_dev_data),
-                            GFP_KERNEL);
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (!res) {
                dev_err(&pdev->dev, "IORESOURCE_IRQ FAILED\n");
                        return -ENODEV;
        }
 
+       adata = devm_kzalloc(&pdev->dev, sizeof(*adata), GFP_KERNEL);
+       if (!adata)
+               return -ENOMEM;
+
        adata->acp3x_base = devm_ioremap(&pdev->dev, res->start,
                                         resource_size(res));