linux-kernel - [PATCH] ASoC: test-component: fix null pointer dereference.

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Message-Id: <20211205204200.7852-1-amhamza.mgc@gmail.com>
Date:   Mon,  6 Dec 2021 01:42:00 +0500
From:   Ameer Hamza <amhamza.mgc@...il.com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, kuninori.morimoto.gx@...esas.com,
        alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org, amhamza.mgc@...il.com
Subject: [PATCH] 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@...il.com>
---
 sound/soc/generic/test-component.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/generic/test-component.c b/sound/soc/generic/test-component.c
index 85385a771d80..8fc97d3ff011 100644
--- a/sound/soc/generic/test-component.c
+++ b/sound/soc/generic/test-component.c
@@ -532,13 +532,16 @@ static int test_driver_probe(struct platform_device *pdev)
 	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 = of_id->data;
+	const struct test_adata *adata;
 	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");
-- 
2.25.1