ASoC: test-component: fix null pointer dereference.

Dereferncing of_id pointer will result in exception in current
implementation since of_match_device() will assign it to NULL.
Adding NULL check for protection.

Signed-off-by: Ameer Hamza <amhamza.mgc@gmail.com>
Link: https://lore.kernel.org/r/20211207142309.222820-1-amhamza.mgc@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/generic/test-component.c b/sound/soc/generic/test-component.c
index 8fc97d3ff01105fb1f802c364b5cd39964f8a294..5da4725d9e16cb5788fe865c2a914ff8698ee503 100644 (file)
--- a/sound/soc/generic/test-component.c
+++ b/sound/soc/generic/test-component.c
@@ -531,17 +531,13 @@ static int test_driver_probe(struct platform_device *pdev)
        struct device *dev = &pdev->dev;
        struct device_node *node = dev->of_node;
        struct device_node *ep;
-       const struct of_device_id *of_id = of_match_device(test_of_match, &pdev->dev);
-       const struct test_adata *adata;
+       const struct test_adata *adata = of_device_get_match_data(&pdev->dev);
        struct snd_soc_component_driver *cdriv;
        struct snd_soc_dai_driver *ddriv;
        struct test_dai_name *dname;
        struct test_priv *priv;
        int num, ret, i;
 
-       if (!of_id)
-               return -EINVAL;
-       adata = of_id->data;
        num = of_graph_get_endpoint_count(node);
        if (!num) {
                dev_err(dev, "no port exits\n");
@@ -552,7 +548,7 @@ static int test_driver_probe(struct platform_device *pdev)
        cdriv   = devm_kzalloc(dev, sizeof(*cdriv),             GFP_KERNEL);
        ddriv   = devm_kzalloc(dev, sizeof(*ddriv) * num,       GFP_KERNEL);
        dname   = devm_kzalloc(dev, sizeof(*dname) * num,       GFP_KERNEL);
-       if (!priv || !cdriv || !ddriv || !dname)
+       if (!priv || !cdriv || !ddriv || !dname || !adata)
                return -EINVAL;
 
        priv->dev               = dev;